He tried to speak, choked, and then tried again.
   'Larry?'
   'You okay?'
   'I'm home. Don't go away; I'll be right in.'
   'Hot damn!'
   Jupp shinned his way carefully down the boom, and using handholds in the bay, made his way to the airlock. He rotated through and nearly collapsed with relief at being back within the confines of the familiar shuttle cabin. He drifted up through the hatch. Wahlquist was standing next to the pilot's seat, waiting for him, his faceplate up, listening intently, compensating already for his lack of sight. Jupp floated to him and without thinking grasped him in a bearhug. Wahlquist was surprised for a moment, but then responded in kind and the two figures stood for a long moment locked in a cumbersome space-suited embrace.
   Finally Jupp felt control return. He held Wahlquist off at arm's length.
   'Okay, buddy, we've got work to do. Let's bag that bird and get out of here.'
   He guided Wahlquist to the copilot's seat and then settled into the comfortable familiarity of the pilot's seat. He jockeyed the thrusters and loved every response of his craft. He loved his eye-hand coordination, and he loved the total absence of the terrible repellant artificial gravity that dwelt on the object out his window.
   He manoeuvred the shuttle until it was beneath the Cosmos once more, craning to see through the window over his head to position the boom. When he was satisfied, he moved to the boom controls at the rear of the flight deck. He released a catch and watched the life-saving mirror drift off to join the other detritus of their mission. Then he raised the boom until it was just beneath the Cosmos. He flipped the switch and set the rotatable stanchion on the end of the boom spinning and with it the payload interface claw. Monitoring the picture from the camera that spun with the claw, he adjusted the speed until the image of the bottom of the Cosmos was fixed, the claw, rotating at exactly the same speed. He then closed the gap to the Cosmos and thrust the claw up into the open wound where the bottom antenna had been. He could feel the shuttle rock as the spinning claw sought a purchase on the satellite and transmitted small torques through the stationary boom. He could see the claw span a frame member and he locked it on.
   Now for the tedious part. He had to slowly decrease the speed of the claw. Too fast and he could snap the boom or the brace in the Cosmos with equally disastrous results if the spinning satellite should collide with the main span of the boom. As he decelerated the tremendous angular inertia of the Cosmos, it was transferred to the shuttle, setting it spinning. Jupp called orders to Wahlquist who operated the thrusters to remove the spin.
   An hour later the Cosmos and the shuttle were one in motion. Jupp slowly lowered the boom until the Cosmos was just out of the bay,.the jury rigged wings that had abetted his entry blocking the final nesting. With some reluctance he floated back down through the hatch, passed through the airlock, and stared once again at the hulking satellite. He anchored a tether to his suit, pulled a torch from the rack and affixed it to his belt.
   He started on the structure with which he had first collided. His skin crawled to see the gaping hole of the laser port, and its smaller, ragged companion where he had found his first grisly hand-hold. He was too fatigued to do more than a butcher job, but it still required fifteen minutes to sever the blunt structure and shove it off into space. He continued around, doing two more in three-quarters of an hour. He was bone tired. He floated back to the deck of the bay and scanned the remains. He was sure he could position the thing to one side of the bay so that the final wing would fit. God help him if it trounced around during re-entry. He hung up the torch, detached the tether and slipped back through the airlock.
   More careful manipulation of the boom brought the Cosmos into the bay, the remaining wing just clearing the hinges where the port clamshell would close. He hit the switch and watched the doors swing shut on their captive with the relief of a beleaguered traveller whose suitcase finally closes. He journeyed once again into the bay and secured the huge bulk as well as possible with various cables and clamps.
   For a final time he floated upon to the flight deck and buckled himself into the pilot's seat. He programmed the computer and they began the descent to near earth orbit. He suggested to Wahlquist that he discuss with mission control the best mode of re-entry with an evaporated vertical stabilizer, tilted his chair back, and slipped into a heavy sleep.
   He awoke fighting the sleep, caught in a fear that if he did not arouse now he never would. He could sense without opening his eyes that the booster was not firing. They were in parking orbit.
   'Back in a minute,' he told Wahlquist, as he prised himself out of his chair. Down on the operations deck he stripped off his gloves and undid his helmet. He went to the medicine cabinet and washed down a couple of Benzedrine tablets. Wouldn't do to sleep through re-entry.
   Back in the pilot's seat, he listened intently to Wahlquist. They had immediately concluded that a routine landing at the Cape was out of the question. Emergency crews were assembling on the dry lake expanses of Edwards Air Force Base in the Mohave. Part of the vertical stabilizer was still intact and the guess was that it would provide sufficient stability during re-entry. The problem was that manoeuvring in the atmosphere would be severely hampered. They could make some gentle turns with judicious use of wing spellers, but without the rudder a proper coordinated turn was impossible. Not a job for computers: no programs were written for laser-blasted equipment. Jupp had to fly. He'd known that as he fell asleep, and as he had pawed for the stimulant.
   His senses were keen as they did the final burn to start their descent. They began in standard orbital orientation, upside down, rockets pointed in their direction of travel. The rockets thrusted and they dropped into an ever lower, ever faster trajectory. As they entered the atmosphere, they flipped over to the normal atmospheric configuration, nose forward, tiled belly down into the heat. Jupp immediately felt the vibration. Something was wrong with the damaged tail. The mangled remains of the rudder still clung to the lower portion of the vertical stabilizer. The vibration grew to a teeth-clattering shudder. Jupp felt a cool wisp of irony amidst his fear. They would die now together, the shuttle and the Cosmos, after being through so much.
   His mind raced, scenes of childhood, his technician's sense wondering what would give out first, a wing come off, a rupture in the hull? Then in a heartbeat it was gone. The shorn rudder succumbed to its own lack of aerodynamic perfection. The tremendous heat of re-entry ablated and then finally swept it away.
   They came out of radio blackout only fifty miles off course. Jupp applied a little spoiler. Not the most perfect turn, his flight instructor would have washed him out had the ball drifted that much in training, but they were back on course. There were the chase planes. God, they were lovely! There was the strip. No graceful turns for position, they were going right down the pipe.
   He was going to miss the painted centre stripe by a quarter mile, but he couldn't worry about that. Without the capacity for a coordinated turn he could not risk a destabilizing crab this close to the ground. A bit too hot, too. Can't be helped. Flaps down. Gear down. Nose up, drop the forward speed as much as possible. Wasn't this strip supposed to be long? Isn't that the warning marker? Nose higher, ease her down. Now, nose down, even her up, here we go, flare, flare! Down, bounce, down, down, DOWN!
   Jupp heard the ground crew swarm over the craft. He began the post-flight shutdown, responding automatically to prompts from ground control. We're down, he thought. We made it. We brought the son-of-a-bitch back. I should feel happy. I do feel happy. He looked over at Wahlquist. Below the sightless eyes was a wide, relieved grin.
   Then he felt the first grip of nausea.

Chapter 4

   Rhein Haartvedt hurried along the narrow, dirty street in the fading light, trying to place his carefully polished shoes in the least distasteful spots, his thoughts eddies of conflicting currents. He badly wanted to give this speech, his maiden public stand against apartheid, but conflicting images of past and future crowded his mind. The knowledge tore at him that the way of life which had nourished him, and which his loved ones loved, must be destroyed. He pictured his father: tall, stern, and unyielding, fair in his own way, but blind to the screaming inequities of their system. He imagined his family — father, mother, two sisters — shocked, bounded, uprooted, deprived of their privileged existence, and he felt the pain they would feel at his perceived betrayal.
   He paused in a rutted intersection and looked again at the crude map Roy M'Botulu had scrawled for him. Roy was wise, witty, urbane. Unbelievable that he came from this place. Rhein tried to ignore it, but the repulsive poverty and ignorance radiated at him from every angle. To subjugate someone like Roy was a crime of monstrous proportions, but was it conceivable that these people could ever be raised from the squalor in which they mired themselves? As a child, he knew in his heart that it was wrong that all the faces at the table should be white, all the hands serving, black. Roy had carefully fanned that flame of disquiet, had shown him the depraved depths of the sin of man against man. He believed those words, had made them his own, and wanted to fight for Roy 's cause, but the quiet passions of a coffeehouse were not reflected in the dim reality surrounding him now. Could these people really rule themselves?
   A greater question, could they rule Rhein's people? Irrationally, his mind filled with an image of his mother in all her refinement banished to one of these hovels, serving some filthy hag with a scrawny child stuck on one teat. Rhein shook his head, banishing such thoughts. If Roy could rise above this, so could others. For the hundredth time he mentally ran through the opening lines of his speech, which were carefully memorized Swahili. According to the map, the small meeting place was just a block away, around the corner. Roy would be there to give him strength.
   He peered in the dark and stepped with his left foot over a puddle. As he placed his foot on the other side and leaned forward to design his next step, he felt strangely heavy, and then he was dying.
   Something shot from the puddle, shattered the femur of his extended thigh near the pelvic joint, and ripped a hole in his upper leg. Then, because he was leaning, it penetrated again at the bottom of his rib cage, blew a thumb— sized hole in his aorta, and punched out through the base of his neck, nicking his ear.
   Rhein collapsed forward heavily, his hips in the puddle, his face in a pile of day-old dog droppings. He struggled to turn his nose from the stench and felt the fetid water seep into-his trousers. He blinked his eyes open and saw a small, fat-bellied child staring at him from a doorway. A dark circle narrowed his vision until all he could see were the eyes. White eyes. Strangely sideways. Roy 's eyes. I'm dying Roy. Trouble for Roy. I'm sorry, Roy.
 
   Maria Latvin held the hand of the figure that lay with swaddled head against the crisp whiteness of the hospital bed. She could feel the pressure of his hand, was sure he knew she was there.
   She looked through a faint mist of tears at the grey, sixtyish man who stood on the other side of the bed. Until the — accident, she had known Ralph Floyd only vaguely as manager of the operations at Paul's laboratory.
   'What are you asking of me?' she asked plaintively. 'How can I do this thing?'
   'Someone must care for him. You've seen that he responds to you. There are many people that depend on him, now we must depend on you.'
   'But he needs medical help. I can not do that.'
   Floyd looked at the man standing quietly behind Latvin's chair, stethoscope draped around his neck.
   'Dr Crawford has done all he can for him here at the lab in terms of immediate medical attention. His body is healthy. He is just not in complete control of it. We need someone to look after him, while we seek expert consultation for his remaining — problems.'
   'But shouldn't he be taken somewhere, to a city, to a big hospital?'
   'There are many complications, my dear. He is the head of a large complex structure, far more than this lab which has been his recent headquarters. Much of this complex runs on its own without his day to day intervention or control.' Floyd shrugged. 'But if he should die, there would be many problems. The situation is even worse in his present state — alive, but not competent to run his affairs. If that news should become general knowledge, the result would be chaos. You must keep him, care for him, while we seek to restore him to full health.'
   Maria Latvin looked deeply into the eyes of the older man. She did not know his true motivation. Was he merely trying to maintain order in a difficult situation, or did he have deeper desires for control of this complex of which he spoke? She felt the pressure of the hand in hers again. She owed this man much. Here was a chance to hold to him, and to the life she had come to love so deeply, a bit longer.
 
   Somebody stood up and turned on the room lights. Isaacs jerked his head up from the photograph he had been studying. In his bleariness he had not realized that the bright Sunday afternoon sun had faded. He scanned the accumulated disarray of their four-day marathon and looked out the window of the conference room. He tried for a long moment to figure out what time it must be from the purpling of the evening light. He finally remembered to look at his watch. 8:38. Eastern daylight. God, was he tired.
   He thought back to the return of the shuttle, the Cosmos laser satellite. Could that have been three weeks ago? Now April was gone, spring replaced by the summer heat of early May.
   The Russians had immediately gone into overdrive to put up another satellite. The laser had been delivered from the development site at Saryshagan to the launch site at Tyuratam four days ago. Isaacs's Office of Scientific Intelligence had worked around the clock to monitor the transition and the operation at Tyuratam. Isaacs looked again at the photograph from the K-H 11 Digital Imaging Satellite. He had-been trying to discern some clue to the nature of the box of electronics sitting on the gantry next to the rocket. Now he looked at the technician who squatted next to it. From three hundred miles up the photograph only showed a fuzzy image of the top of the man's head, his back, the tops of his thighs and his right arm extended to a knob on the electronics. I bet that bastard's tired too, Isaacs thought to himself. Isaacs knew the man well, as well as one ever could by studying the flat two-dimensional creatures that inhabited these photos. They had picked him out from the first photographs taken a month ago at Saryshagan by the un-Slavic mop of curly hair that occupied the rear half of his balding head. They had taken to calling him Curly. Isaacs was amused at the odd resentment he had felt when Boswank finally got a make on him, identifying him as plain old Fyodr Rudikov. Fyodr was a subterfuge, an alias. His real name was Curly.
   Curly had arrived last Thursday at the launch site at Tyuratam along with the laser components. Since then Curly had been working sixteen-hour days, just like Isaacs's team. The launch of the new laser could be as soon as next month. Curly was on the front line down there, beating himself and his crew to greater effort. In his room, in the bowels of this building, and in many others, thousands of American intelligence people focused on the same event. When would the launch be? What were the capabilities of this new laser? Could it be stopped? Should it be stopped? Would it strike? Where? Were there defensive measures?
   Isaacs shoved his rolled cuffs further up his arms, then raised his arms in a stretch over his head. He looked at the bedraggled group around him. Martinelli sat with one of his aides in a circle of coffee cups and cigarette butts. They were sorting the latest pile of useful photographs culled from the reams that poured in from a host of satellites. Bill Earls huddled with Pat Danielson at the far end of the table. Bill had isolated the crates which housed the laser components from among the bewildering array of associated rocket parts. The task now was to glean every scrap of information they could as the relevant crates were unpacked and their contents incorporated into the rocket.
   Danielson ran liaison with the computer. When Saris found some shred of evidence in a portion of one photograph, Danielson or one of her cohorts would dash off to retrieve that part of the photo from the computer memory and run it through a panoply of analysis routines, reducing noise, heightening contrast, pulling this feature then that from data, until they could do no more. Then they would move to another photo or call to Martinelli to order up a new one, concentrating on whatever feature seemed likely to be particularly illuminating. The Russians knew they were being spied upon. When they could not avoid exposing a piece, they would sometimes move it about at random, specifically to foil analysis teams. Then Isaacs's group would race to see if they could relocate the missing component, all the while searching for new clues.
   Boswank had gone off to attend to other concerns. Several of his deputies remained, continually updating a list of target material amenable to investigation by clandestine networks on the ground. They conferred often with Henry Sharbunk, the representative from the National Security Agency, where a similar emergency operation progressed.
   Isaacs looked again at the box Curly was operating on. If it held a power supply, as Bans maintained, what would that tell them? How the hell could they learn anything useful if they didn't know what it powered? He had a strong urge to shout down at Curly, to force him to turn his face up, so he could see him, talk to him. Demand to know where he intended to install that box, what it would do.
   He snapped out of this fantasy when he felt a gentle hand on his shoulder. He looked up into Kathleen's eyes. She was deeply sombre. He looked down at the note in her hand and took it from her. His chest constricted and his stomach felt a wince of sympathetic nausea. He had been expecting this, but he sickened anyway. Ed Jupp was dead.
   Isaacs dropped his head onto his hand, replaying in his thoughts a fortnight of increasing agony. He had never met the man, but followed the progress, through messages such as these, as his hair fell out and the pain turned his guts to liquid fire.
   Isaacs finally looked up at Kathleen and nodded to her. She gave his shoulder a brief, hesitant pat, and then left.
   Isaacs finally cleared his throat and raised his voice above the hubbub of muted conversations.
   'Excuse me!' He waited until he had their attention. 'I just got a note from Walter Reed Hospital. Major Edward Jupp died an hour ago from radiation poisoning.'
   Everyone in the room lowered their eyes from Isaacs and did little things with whatever objects lay immediately in front of them.
   'It's late Sunday. None of us have seen our families in a while. We've accomplished a lot in the last few days, and this rocket's not going anywhere,' he gestured at the photograph of Curly before him. 'Let's break and get a good night's rest. We'll hit it again tomorrow.'
   A riffle of shuffling and glances passed around the table. Despite the fatigue, putting down such an all-consuming task was not easy. Finally Martinelli spoke.
   'Damn good idea. I came just that close to ordering up a new photo of the grounds in my coffee cup.' He turned to his aide. 'Let's just leave these in the piles as we have them,' he pointed at the stacks of sorted photographs. 'Lord knows there'll be a fresh batch tomorrow.' He got up and stretched.
   Slowly the other groups around the table began to arrange their material so that they could pick up again in the morning. They filed out one at a time, disoriented by the need to cease the intense effort and think of home and rest. Isaacs sat staring at the top of Curly's head. He finally realized that everyone had left but Danielson. She moved over and sat down next to him.
   'I'm sorry about Jupp,' she said, her voice throaty. Isaacs nodded and looked at her, not quite seeing. Finally she spoke again. 'Do you have enough energy to give me some advice?'
   Isaacs rubbed his eyes with the palms of his hands and worked his shoulders. 'I can try.' He gave her a wan smile. 'I have this vague feeling I'm not at the peak of efficiency.'
   Her voice was apologetic. 'I'm sorry to trouble you, but I have a conflict. Maybe you can help me resolve it. I've been spending a fair bit of time on that seismic signal you asked me to investigate. I had to drop that when this rush came up, of course. The problem is the people I've been working with at the Cambridge Research Lab. They know I've got an emergency down here, but they don't know what or how severe. They've assembled seismic data from a lot of universities and apparently feel there is significant new information in it, more thorough coverage. They've been pressuring me to go back up and work on it, as I originally promised. I don't quite know what to tell them. Should I tell them to put the whole flung on indefinite hold? Should I try to get up there for a little while if we can see a break here? I'm not sure how I should respond, but I don't think I should just keep putting them off.'
   Isaacs thought for a moment. His pleasant days in Florida seemed another era, another world. 'We're going to be at this until the launch, a month, six weeks, several months if they get hung up somehow. Then a different show once it's in orbit. On the other hand, we're over a hump here in terms of sorting the procedures at the launch site.' He looked at her intently. 'Saris has been particularly pleased with your work, by the way, thinks you have a real flair for isolating important ingredients in the photos.'
   Danielson smiled in pleasure.
   'That means you're especially valuable to us on this project, but we can't keep going with the intensity we have the last four days, and shouldn't have to. If you took a break to do something else, you might come back fresher. How would you feel about that?'
   'I understand how crucial this effort is, but I'm just one member of the team and I'm still fascinated by this seismic thing.' She looked at him, searching his eyes. 'I'd hate to see it dropped.'
   He pushed back in his chair. 'Let me talk to Saris. See if he thinks he can spare you. We'll have a better feeling of developments by midweek. Maybe we can work in a break for you.'
   'Thank you. I'd like that. I'll hold the Lab at bay and check with you later in the week.'
   She rose and left the room at a surprisingly fresh pace. Isaacs picked up the picture of Curly between his index and middle finger and sailed it gently to the middle of the conference table, a thousand dollar frisbee, one of several hundred stacked around the room. He checked that the door was locked on his way out, bid good evening to the security guard posted outside, and headed for his office, picturing a tall drink and cool, soothing sheets.
 
   Sometime after lunch in the middle of May, Pat Danielson paced down the long central corridor which carried her through the multi-numbered interconnected buildings of MIT. She barely recalled catching the ride from the lab in Lexington into Cambridge. With little sleep in the last three days, she felt the hollow tension of deep fatigue. Atop that fundamental, like frosting on a cake, rode the giddy feeling of accomplishment that accompanies an intellectual breakthrough. That feeling provided the motive force that directed her numb legs to maintain a reasonable pace.
   She crossed the main lobby decked with illustrations of ongoing student projects and pushed out the door. Pausing at the top of the steps, she blinked in the hazy sunlight. After gazing a moment at the busy traffic on Massachusetts Avenue , she leaned back against one of the tall fluted pillars and closed her eyes. Her head buzzed with the lack of sleep.
   A brazen honk snapped her eyes open. She stood for a moment trying to sense if she had actually fallen asleep on her feet. Then she focused on the cab parked on the far side of the street. She gave a quick salute to the driver and proceeded down the steps where she stopped to push the walk/wait button. As the flash of red and yellow lights signalled a halt to the flow of traffic, she crossed to the taxi and climbed in the rear from the driver's side.
   The driver cocked an ear and Danielson mumbled, 'Airport — Eastern shuttle.'
   On the plane she tried to practise what she would say to Isaacs. Every time she began to assemble her excited thoughts into coherent English sentences, the words would drift and dissolve as her brain fought to sleep. Back in her office in the Langley headquarters she dropped her briefcase on her desk and, still standing, punched the phone for Isaacs's office.
   'Yes, Miss Kate?' Isaacs fingered the intercom in answer to the buzz.
   'Pat Danielson, sir. On the phone.'
   'Put her on the line,' Isaacs said, reaching for his telephone. 'Hello, Pat? Isaacs, here.'
   'We've completed the analysis on the periodic seismic signal,' Danielson reported. 'We've got something big, but I don't know what.' She sounded excited, only an occasional slurred word indicated fatigue.
   Isaacs looked at his watch. 'It's four-thirty now, do you want to talk this afternoon, or wait until tomorrow?'
   'Well, I thought you might not be free until tomorrow, but I'd rather get it off my chest. That might help me get some rest tonight. I've lived with the computer here and at the Cambridge Research Lab the last week and haven't had much sleep. I could at least give you the bottom line, then we could go into detail tomorrow sometime, after I've had a good night's sleep.'
   'Okay, come on up.' Isaacs buzzed Kathleen to show Danielson in on her arrival and cleaned his desk of the latest summaries concerning the new Russian laser being readied for launch at Tyuratam.
   Danielson arrived two minutes later. She looked haggard, but an intensity burned in her eyes. She dropped into the proffered chair, took a deep breath, and held it momentarily before exhaling slowly through pursed lips.
   Isaacs waited for her to compose herself. Danielson's mind spun with the reams of data she'd lived with over the last few days as she endeavoured to decide where to begin.
   'It's not a surface effect,' she blurted out. 'In places we can clearly track it from the mantle to the core. It then seems to head on back to the surface. A scattered wave would have an attenuated amplitude. This grows in strength as it leaves the core and passes into the mantle.'
   'Does it move between two fixed points?' inquired Isaacs, already calculating the surveillance apparatus that could be used once a location was specified.
   'On the contrary,' replied Danielson, destroying that train of thought. 'At first it seemed to move around randomly although confined to certain latitudes. It's too weak to follow continuously and it seemed to be taking arbitrary trajectories.
   'I racked my brain trying to find a systematic effect that would tie all the data together. I only hit upon it late last night and finished working it out this morning. The path is fixed all right, but not to the earth.'
   Isaacs's brows rose slightly in surprise. He didn't speak but fixed his gaze on Danielson as he waited for her to continue.
   'At first I thought it always pointed in the same direction with respect to the sun. Not at the sun, but at a fixed angle to it. But that wasn't quite it, so I tried a position fixed to the distant stars and that fits like a glove, as nearly as I can tell.'
   'Aaah, wait a minute,' Isaacs leaned forward on his desk and clasped his hands. 'Run that by me again.'
   'Okay,' Danielson pointed her left index finger at the ceiling and moved her right index finger in a circle around it, pointed at the floor. 'As the earth rotates exactly once on its axis, marking a sidereal day, a given point on its surface will fall on the line of motion we have determined,' she moved her right finger back and forth past her left, 'and a fixed distant star will be directly overhead once more. Because of the earth's motion in orbit around the sun, the interval between times when the sun is directly overhead, the solar day, is four minutes longer. Sidereal time represents a more basic inertial clock, uncomplicated by the orbit of the earth, and that is the time this phenomenon keeps.'
   'Let me get this straight,' said Isaacs. 'You're claiming that this motion is fixed in space? Just as the axis of the earth's rotation points in a fixed direction, towards Polaris?'
   'Absolutely.' Danielson gave an assertive nod which caused a curl to slip down on her forehead. She pushed it back with a gesture that suddenly recalled her femininity to Isaacs, but continued at a professional clip.
   'Something moves on a line through the centre of the earth. It always comes up near thirty-three degrees north latitude, goes down through the centre of the earth, and comes out again at thirty-three degrees south latitude. Then it goes back to the centre and comes out once again at thirty-three degrees north latitude. But since the earth rotates and the direction along which it moves is fixed, it never comes up at the same point twice.'
   The woman's fatigue receded as she endeavoured to elaborate her argument. She jammed a slim finger onto Isaacs's desk. 'Not only is this trajectory independent of the rotation of the earth on its axis, it's also independent of the motion of the earth around the sun. We have good data now spanning three months. In that time the earth has moved one quarter of the way around the sun in its orbit, an angle of ninety degrees. Yet the seismic trajectory has pointed to the same direction in space, a point somewhat to the north and midway between the constellations of Gemini and Cancer. If you extend the line of motion through the earth's centre and out the other side, it intersects the sky at a point just south of the constellation of Capricorn.'
   Danielson leaned back and looked out the window over Isaacs's shoulder, as she sought an analogy.
   'It's as if there were a string tied at two opposite points in space. Cancer and Capricorn, and passing through the centre of the earth. That string intersects a different point on the earth's surface every second as the earth rotates, but the direction in which the string leads is independent of the rotation of the earth on its axis or its revolution in orbit about the sun.'
   Isaacs and Danielson stared at each other and then diverted their gazes to random points in the room. Danielson, convinced of the certainty of her conclusions, nevertheless abandoned herself to retracing mentally the steps she had taken over the last few days. She hadn't the mental energy presently to contemplate the impact of her efforts. Isaacs's thoughts took two tracks simultaneously, trying to absorb the significance of the raw conclusions just presented and beginning to catalogue the possibilities for weakness or errors in the analysis leading to those conclusions.
   When he spoke, Isaacs took a middle ground, that of attempting to elicit key facts. 'Tell me more about the nature of the signal itself. How close to the surface does it get? What other characteristics does it have?'
   Danielson leaned back and massaged her eyes with thumb and index finger while she replied, 'Pinning down the position at a given instant is difficult because of the weak signal.' She removed her hand from her face and looked intently at Isaacs. 'Our latest estimate of the period is eighty and a half minutes, give or take a few seconds. We don't get a signal from the mantle, but then we pick it up as it proceeds back towards the core. There is also difficulty in estimating the propagation velocity without accurate positions, but it seems to pick up speed as it approaches the core of the earth. That is crudely consistent with the behaviour of an ordinary sound wave since the sound velocity goes up in the hotter parts of the core. That's about the only thing it does like an ordinary seismic wave.'
   'You say that it goes right through the centre of the earth?'
   'That's right. It goes down on what seems to be a straight line, then proceeds straight out to the opposite surface, always on a line pointing midway between Gemini and Cancer. As I said, it doesn't behave like a wave in the sense that a wave gets weaker as it proceeds. This may get weaker going down, but it gets stronger, if anything, on its trip up. Then, as far as we can tell, the next cycle is identical.'
   Isaacs thought a moment. 'So the net power in the signal isn't changing.'
   'Right again. It seems as if the strength of the signal only depends on where it is in the cycle, and that the power is the same cycle after cycle.'
   Isaacs paused, then asked, 'Do you see any way this could be artificial? Man-made?'
   'Not without a position fixed on the earth's surface,' replied Danielson.
   'But it seems not to be a normal seismic phenomenon?' 'Too many of the properties are strange, particularly if the path is fixed in space and not with respect to the earth.'
   'Could there be some tidal effect? A collective action of the sun and moon?'
   'I don't see how. There's no obvious way to trigger such an event. In any case there seems to be no connection with the position of the moon which has orbited several times without changing anything while we've monitored the data. Still, we're dealing with something strange here, so possible subtle or indirect tidal effects should probably be explored.'
   Isaacs fixed his gaze on the tired young woman in front of him. 'I think you're right: you're onto something peculiar,' he said slowly. 'Why don't you go home and get a good night's sleep. Come in tomorrow and we'll go into your evidence in detail.'
   Danielson smiled abashedly, acknowledging her fatigue once more. 'Fine. I'll see you tomorrow morning.' She rose and let herself out the door.
   Isaacs leaned back and clasped his hands behind his head, staring at the ceiling. He quickly decided he needed more information. A detailed discussion with Danielson tomorrow might show some flaw in the analysis. That was unlikely, however, despite the strange nature of the situation, considering the careful work Danielson usually produced and the sophisticated computer analysis groups on which she relied. But more information or no, this problem required expert consultation to begin even to categorize it.
   He leaned forward and punched the intercom. 'Kathleen?' When she responded, he said, 'Get in touch with Martinelli. I want a one kilometre resolution photomontage of everything within ten degrees of thirty-three degrees north and south latitude and a first order scan for anything out of the ordinary. I don't know specifically what to look for.'
   Isaacs then leaned back and contemplated the situation. After some time he realized that he was imagining an extra— terrestrial civilization teaming a mysterious ray at earth from some point in space. He shook his head ruefully as he put Danielson's problem out of his mind and retrieved the Tyuratam summaries from his desk drawer.

Chapter 5

   Hot, late afternoon air rustled through the kibbutz. Duma Zadoc cautiously flipped a switch and smiled as the old water pump started up with a functional dm, rewarding her afternoon's efforts. She wiped a forearm across her forehead, replacing sweat with grease, and kneeled to her final task. Methodically, she began to cinch down the bolts of the pump housing, a diametric pair at a time to ensure even pressure. She cringed as the first of the fourth pair turned too easily and the head of the bolt sheared off. With an uncharacteristic show of disgust, she threw the wrench down. The bolt head popped loose from the jaws of the wrench and rolled crazily across the floor. Duma stood up with hands on hips and watched with dismay as droplets of water began to seep from the seal near the broken bolt. As she tried to decide whether to attack the lodged remains of the bolt this afternoon or wait until tomorrow, a strange noise suddenly rose above the sound of the clattering pump. It came from the nearby orange grove, a mixed roar and hiss.
   Terrorists! thought Duma and the image of her mangled infant flashed before her eyes. Thirty-five years as a sun-toughened sabra gave her the instincts to react Godly and quickly, quelling any hint of desperation. She raced from the pump house for the alarm. She punched the button starting the klaxon's howl, then ran the forty metres to the attack shelter and stood at the door assisting the children and then older kibbutz members who streamed inside.
   Despite the sound of the siren and the hubbub of voices, Duma kept an ear tuned on the original sound. She had realized that there was something unorthodox about it. Unlike an incoming mortar round, this noise had got quieter and there had been no deadly, thumping explosion.
   She wandered away from the shelter towards the orange grove. She heard the noise again, faint but growing in volume. Although the sound sent a chill down her spine, something told her there was no immediate danger. She squinted up towards the direction indicated by her ears, but saw no sign of the source. She followed the indicated trajectory as the noise reached peak intensity and then vanished. At the same time she saw a puff of dust arise just beyond the barbed wire fence of the compound.
   Duma crawled through the fence and paced back and forth in the area where the dust had kicked up. She half expected to find an unexploded shell casing. Instead, she saw absolutely nothing. Puzzled, she crossed the fence again. As she headed back into camp, she waved an 'all clear' sign at a compatriot, and the klaxon faded away. She decided the broken bolt in the pump housing could wait for another day.
 
   Two more weeks were absorbed in the intensive routine of monitoring developments at the Soviet launch site at Tyuratam. Isaacs spent rare moments with Danielson discussing the seismic project. There seemed to be no flaw in Danielson's analysis, but they could not contrive a reasonable explanation for her data. The photomontage of the suspect latitudes provided by Martinelli showed nothing of interest. The routine was interrupted by a phone call.
   Isaacs hung up the telephone and glared at the opposite wall of his office. He clinched his teeth, rhythmically rippling the prominent muscles over his jaws. The call had been simple. Kevin McMasters's secretary requested that Isaacs report to the office of the Deputy Director immediately. The secretary's voice was briskly formal, as that of the second in a duel, announcing his man's choice of weapon. It suggested the black mood of the official who had given the order. Isaacs instantly recognized the root of the problem; indeed, he had expected the call. His bid to eliminate two more of McMasters's outmoded pet projects had succeeded. McMasters could not counter Isaacs's arguments, but he would find some way to strike back, his vindictive urge whetted by defensiveness over his role in the fate of the FireEye satellite and the orbital confrontation to which that had led. Isaacs had no clue to McMasters's target, something not immediately subject to objective scrutiny, but he was certain that the ploy was about to begin.
   He stood up and faced the window for a moment, hands clasped behind his back, unconsciously rocking up and down on the balls of his feet. Then he turned abruptly and walked briskly out of his office.
   'I'm going to see McMasters,' he announced to Kathleen.
   She nodded, confirming her deduction.
   Isaacs used the stairs to ascend two flights and then paced a long hallway and half of another before turning into the suite of offices commanded by the Deputy Director for Central Intelligence.
   The secretary looked up at his arrival and arched an eyebrow.
   'He'll see you in a moment — won't you have a seat?' Without the protective anonymity of the telephone receiver, she seemed pleasant and proper, giving no hint of reflected animosity.
   Isaacs replied, 'Thank you,' curtly, but remained standing, fidgeting tensely. For five minutes his irritation grew, but then he made a strong conscious effort to calm himself. Obviously, McMasters designed this childish trick, requiring him to cool his heels, to put him in a rash state of mind. He drew a deep breath and let it out slowly, glanced at the secretary and settled into a chair.
   In the next ten minutes he catalogued most of the projects which commanded his direct attention. Tyuratam continued to be the central concern, particularly planning sessions to suggest strategies when the launch occurred. He glanced at the calendar on his watch, June 2, seven weeks since the first laser was destroyed and the Soviets had begun their crash programme on the second. Launch was anticipated in two or three more weeks. Surely, there was no ground for attack there where everybody was pitching in on the common goal. They had not spent time on Mozambique and still remained uncertain about the origin of the arms cache. Could that be a weak point? Their lack of progress on some back burner problem? He attained a controlled state of mind, yet was unable to fathom where McMasters would elect to apply pressure.
   The intercom on the secretary's desk buzzed, and he heard the low fidelity rattle of McMasters's voice though he could not make out the precise words. 'He'll see you now.'
   This tune Isaacs caught a note of excitement, a school child announcing a fight on the playground. Despite the imminent confrontation, Isaacs found this droll. He maintained a serious face as he opened the door to McMasters's office, but just before he stepped through he looked back over his shoulder and gave the woman a broad wink. To his satisfaction, this incongruous act on the part of a respectable, if beleaguered, high official of the organization caught her by surprise. Her eyes widened and her mouth dropped open slightly. Isaacs closed the door behind him.
   Several steps took him to McMasters's desk in the middle of the spacious room. The DDI sat erect, but with eyes focused on the folder on his desk. A hint of pot belly spoiled his medium build. At fifty-nine, short, wavy, salt— and-pepper hair covered his head, the waves shorn short on the side. His face was an elongated rectangle, with pale green eyes that receded into the surrounding folds, giving no access. His aquiline nose suggested the refinement evident in his compartment. He had a habit of holding his chin high so that he literally looked down his nose at people to whom he spoke.
   Now he raised his gaze to Isaacs and spoke in a measured, cultured voice, 'What — is — this — bull — shit?'
   The epithet was delivered slowly, poisonously, reinforced by the contrast to his excessively proper demeanour.
   'Sir?' Isaacs said, taken aback despite himself. McMasters picked up the folder in front of him and gestured with it.
   'With the fate of this nation and the free world at stake, you have deliberately chosen to squander the time of yourself and others and the resources of the Agency in an absurd wild-goose chase after earthquakes that follow the stars! We are not here to do astrology, Mr Isaacs.'
   Isaacs caught a glimpse of the folder. It was labelled QUAKER, the code name for the strange periodic seismic signal. His mind whirled and locked like a magnetic computer tape searching for the appropriate data strip. He felt a certain relief. He was involved in a number of areas of immediate importance where McMasters's interference would have been disastrous. Apparently, those were safe for a moment. Yet McMasters had chosen shrewdly. Isaacs would be hard put to objectively defend his interest in the bizarre seismic signal which Pat Danielson continued to study when she could spare the time from Tyuratam. There was not the slightest hint that it represented a danger in any way. Nevertheless, his career-honed instinct warned him that to neglect the signal with its true nature still unknown would be foolhardy.