«I think I understand. I couldn't order a chimp to carry someone into an airlock and cycle it.»
   «Exactly. By itself the chimp wouldn't know that what it was doing was wrong. It lacks discrimination, that ability we call sentience. So every order is reviewed by the personality to ensure it is not harmful or illegal. Therefore, although you could tell a chimp to pick up this particular object, and point it at that person's head, then pull this small lever at the bottom, it would not perform the act. The chimp does not know the object is a pistol, or that pulling the trigger is going to fire it, nor even the consequences such an action would result in. But the habitat personality does, and its neural strata has the capacity to review every single order as it is issued. The order to murder would be erased, and the police would be informed immediately.»
   «So what went wrong this time?»
   «This is what I find most worrying about the incident. You understand that the habitat personality is what we call a homogenized presence?»
   «I crammed biotechnology for three months before I came here, but it was just basic stuff. I know Eden has a large neural strata. But that's about all.»
   Hoi Yin crossed her legs. Distracting, very distracting.
   «If you look at a cross-section of the habitat shell you will see it is layered like an onion,» she said. «Each layer has a different function. On the outside we have dead polyp, several metres thick, protecting us from cosmic radiation, and gradually ablating away in the vacuum. Inside that is a layer of living polyp which gradually replaces it. Then there is a very complex mitosis layer. More polyp containing nutrient-fluid arteries. A layer for water passages. Another with waste-extraction tubules and toxin-filter glands. And so on. Until finally the innermost layer, landscaped, smeared with soil, and laced with sensitive cells. But the layer just below that surface one is what we call the neural strata. It is nearly a metre thick, and connected to the sensitive cell clusters via millions of nerve strands. Consider that, Chief Parfitt, a strata of neural cells, a brain, measuring one metre thick, and covering almost sixty-four square kilometres.»
   I hadn't thought of it in quite those terms before. Too unnerving, I suppose. «It ought to be infallible.»
   «Yes. But Eden's thoughts work on parallel-processing principles. A neural network this large could not function in any other fashion. There is only one personality, yet its mind is made up from millions of semi-autonomous subroutines. Think of it as analogous to a hologram; if you cut up a hologram each little piece still contains a copy of the original image; no matter how small the fragment, the whole pattern is always there. Well, that is how the personality works, complete homogeneity. It can conduct a thousand—ten thousand—conversations simultaneously, and the memory of each one is disseminated throughout its structure so that it is available as a reference everywhere in the habitat. Indeed, all its knowledge is disseminated in such a fashion. When I converse with it through affinity, I am actually talking to a subroutine operating in the neural strata more or less directly below my feet. The amount of the strata given over to running that subroutine is dependent purely on the complexity of the task it is performing. If I were to ask it an exceptionally difficult question, the subroutine would expand to utilize more and more cells until it reached a size appropriate to fulfil the request. Sometimes the subroutines are large and sophisticated enough to be considered sentient in their own right, sometimes they are little more than computer programs.»
   «The murderer got at the safeguard subroutine, not the chimp,» I blurted.
   Her eyebrows rose in what I hoped was admiration. «Precisely. Somehow the murderer used his or her affinity to suspend the subroutine responsible for monitoring the orders given to that particular chimp. Then while it was inactive, the order to collect the pistol and stalk Penny Maowkavitz was issued to the chimp. The monitoring subroutine was then brought back on-line. Eden was not aware of the rogue order in the chimp's brain until it actually observed the chimp shooting the pistol. By then it was too late.»
   «Clever. Can you prevent it from happening again?»
   She looked at the floor, her lips pulled together in a delicious pout. «I believe so. Eden and I have been considering the problem at some length. The servitor monitoring subroutines will have to be reconfigured to resist such tampering in future; indeed all of the simpler subroutines will have to be hardened. Although it is of no comfort to Penny Maowkavitz, we have gained considerable insight into a vulnerability which we never previously knew existed. As with all complex new systems, methods of abuse can never be fully anticipated; Eden is no exception. This has given us a lot to think about.»
   «Fine. What about extracting a memory of the murderer from the chimp? What he or she looks like, how big, anything at all we could work with.»
   «If there was a visual image, I expect I could retrieve it given time. But I do not believe there is one. In all probability the murderer was nowhere near the chimp when the order was loaded. Whoever they are, they have demonstrated a considerable level of understanding with regards to how the habitat servitors work; I don't think they would make such an elementary mistake as allowing the chimp to see them. Even if they did need to be near the chimp in order to suppress the monitor subroutine, they only had to stay behind it.»
   «Yeah, I expect you're right.»
   Hoi Yin gave a small bow, and rose to her feet. «If there is nothing else, Chief Parfitt.»
   «There was one other thing. I noticed you were with Wing-Tsit Chong at the funeral.»
   «Yes. I am his student.»
   And did I hear a defensive note in her voice? Her expression remained perfectly composed. Funny, but she was the first person so far who hadn't said how much they regretted Penny's death. But, then, Hoi Yin could give an ice maiden a bad case of frostbite.
   «Really? That's auspicious. I would like to study under him as well. I wondered if you could ask him for me.»
   «You wish to change your profession?»
   «No. My neuron symbionts should be working by tomorrow. Dr Arburry said I'd need tutoring on their use. I would like Wing-Tsit Chong to be my tutor.»
   She blinked, which for her seemed to be the equivalent of open-mouthed astonishment. «Wing-Tsit Chong has many very important tasks. These are difficult times, both for him and Eden. Forgive me, but I do not believe he should spend his time on something quite so trivial.»
   «None the less, I'd like you to ask him. At most it will take a second of his valuable time to say no. You might tell him that I wish to perform my job to the best of my ability; and to do that I must have the most complete understanding of affinity it is possible for a novice to have. For that, I would prefer to be instructed by its inventor.» I smiled at her. «And if he says no, I won't take offence. Perhaps then you'd consider the job? You certainly seem to have a firm grasp of the principles.»
   Her cheeks coloured slightly. «I will convey your request.»
 
   • • •
 
   Shannon called me just after Hoi Yin walked out.
   «I think you're psychic, boss,» she said. The image on the desktop terminal screen showed me her usual grin was even broader than normal.
   «Tell me.»
   «I've just finished running down the wills of all those Boston members you gave me. And, surprise surprise, they all follow exactly the same format as Maowkavitz's; a trust fund to be administered in whatever way the trustees see fit. And they all nominate each other as trustees. It reads like financial incest.»
   «If they were all to die, what would the total sum come to?»
   «Christ, boss; half of them are just ordinary folks, worth a few grand; but there's a lot of them like Penny: multimillionaires. It's hard to say. You know the way rich people tangle up their money in bonds and property deals.»
   «Try,» I urged drily. «I expect you already have.»
   «OK, well you got me there, boss; I did some informal checking with Forbes Media corp for the biggies. I'd guess around five billion wattdollars. Purely unofficial.»
   «Interesting. So if their wills aren't changed, the last one left alive will inherit the lot.»
   «Holy shit, you think someone's going to work down the list?»
   «No, I doubt it. Too obvious. But I still want to know what Boston intends to do with all that money.»
 
   • • •
 
   It was Nyberg who drove me to my interview with Antony Harwood. From the way she acted I thought she might be angling for some kind of executive-assistant role. She told me how she'd sorted out my interviews with the three trustees nominated in Maowkavitz's will. I also got a résumé on her career to date, and how she was studying for her detective exams. But she was a conscientious officer, if a little too regimented, and obviously trying to advance herself. No crime.
   I did wonder idly if she was a covert agent for JSKP security, assigned to keep tabs on me. It seemed as though she was always there when I turned round. Paranoid. But then it was a growing feeling, this awareness of constant observation. The more I had Eden explained to me, the more conscious I was of how little privacy I had from it. Did it watch me sleeping? On the toilet? Eating? Did it laugh at my spreading gut when I took my uniform off at night? Did it have a sense of humour, even? Or did it, with its cubic-kilometre brain, regard us all as little more than insignificant gnats flittering round? Were our petty intrigues of the slightest interest? Or were we merely tiresome?
   I think I had the right to be paranoid.
   Antony Harwood's company, Quantumsoft, had a modest office building in what aspired to be the administration and business section of town. A white and bronze H-shaped structure surrounded by bushy palm trees which seemed a lot bigger than five years of growth could account for. It was all very Californian, quite deliberately.
   Quantumsoft was a typical Californian vertical. After the Big One2 quake in AD 2058 a lot of the high-tech companies resident in Los Angeles quietly shut up shop in the old city and moved up to High Angeles, a new asteroid that had been shunted into Earth orbit by controlled nuclear explosions. The asteroid project had been sponsored by the California legislature; always Green-orientated, the state wanted the raw materials from the rock to replace all its environmentally unsound groundside mining operations. A laudable notion, if somewhat late in the day. The kind of companies which ascended tended to be small, dynamic research and software enterprises, with a core of highly motivated, very bright, very innovative staff. And, ultimately, very wealthy staff. The verticals were geared towards producing and developing cutting-edge concepts, a pure, Green, cerebral industrial community; leaving their groundside subsidiary factories with the grubby task of actually manufacturing the goods they thought up.
   High Angeles itself was one of the largest asteroids in the O'Neill Halo after New Kong, although even its central biosphere cavern wasn't a fifth of the size of Eden's verdant parkland. After the miners finished extracting its ore and minerals, and the verticals moved in, it developed into little more than a giant spaceborne Cabana club for clever millionaires. Millionaires who made no secret of their resentment with the unbreakable fiscal ties which bound the asteroid to Earth. They no longer had to endure quakes, and gangs, and ecowarriors, and crime, and pollution, but their physical safety came with a price: specifically Californian taxes.
   However distant it might be from the battered Pacific coast, High Angeles was still owned by the state. With its vast mineral reserves and its dynamic verticals the asteroid remained the single largest source of revenue for the legislature. After pouring billions of wattdollars into its capture and starting up its biosphere, the Earthside senators weren't about to let its privileged occupants cheat ordinary taxpayers out of their investment by turning it into an independent tax haven, no matter how much bribe money they were offered.
   Ironically, as High Angeles siphoned off talent and wealth from Earth, so Eden drew the cream of the O'Neill Halo. The challenge Jupiter presented proved an irresistible attraction to the corporate aristocracy. Pacific Nugene was a prime example. Quantumsoft was another.
   Antony Harwood rose from behind his desk to greet me as I entered his office: an overweight fifty-five-year-old with a thick black beard. He had changed out of his mourning suit since the funeral, wearing designer casuals as if they were a uniform, open-neck silk shirt and glossy black jeans, along with a pair of hand-tooled cowboy boots.
   Some people, you just know right from the moment you clap eyes on them that you're not going to like them. No definable reason, they just don't fit your sensibilities. For me, Harwood was one such.
   «I can give you a couple of minutes, but I am kinda busy right now,» he said as we shook hands. As generous and jovial as his size suggested, but with a quality of steel.
   «Me too, someone got murdered a couple of days ago. And, understandably, I'm rather anxious to find out who did it.»
   Harwood gave me a second, more thorough, appraisal, his humour bleeding away. He indicated a crescent sofa and table conversation area next to the window wall. «I heard what they say about you: the honest policeman. JSKP should have put you in a museum, Chief, the rarity value oughta haul in a pretty good crowd.»
   «Along with the honest businessman, I expect.»
   There was a flash of white teeth in the centre of his beard. «OK, bad start. My mistake. Let's backtrack and begin fresh. What can I do for you?»
   «Penny Maowkavitz. You knew her quite well.»
   «Sure I knew Penny. Sharp character, her tongue as well as her mind.»
   «You must have spent a lot of time with her, the two of you were contemporaries. So firstly, did she ever say anything, drop any hint, that she thought she might be in danger?»
   «Not a thing. We had disagreements. It was kinda inevitable, the way she was, but they were all professional differences. Penny never got personal in any way, not with anyone.»
   «What does Boston intend to do with her money? Your money too, come to that?»
   He smiled again, showing an expression of polite bafflement. «Boston? What's that?»
   «What does Boston want the money for?»
   The smile tightened. «Sorry. No comprende, señor
   «I see. Well, let me explain. For an act of premeditated murder to be committed, logically there must be a motive. Right now I have exactly three suspects: Bob Parkinson, Pieter Zernov, and yourself. You three have the only motive my investigative team has been able to uncover so far. You have been placed in sole charge of a trust fund worth eight hundred million wattdollars, with absolutely no legal constraints or guidelines on how you spend it. So unless you can convince me right here and now in this office that you don't intend to simply split it three ways and disappear into the sunset, you're going to find yourself sleeping in my department's unpleasantly small hospitality suite, with no room service, for the rest of your life. Comprende? »
   «No way. You can't make that bunch of crap stick, and you know it. This is just blatant intimidation, Chief. My legal boys will put blisters on your ass, they'll kick you so hard.»
   «You think so? Then try this. I wasn't joking when I said you're a murder suspect. That officially makes you a potential hazard to other residents. And as the lawful civil security officer of an inhabited space station I have the right to expel anyone I regard as a possible endangerment to the population of said station or its artificial ecosphere environment. Check it out: clause twenty-four in the revised UN Space Law Act of 2068, to which Eden is a signatory. Boston will just have to start the revolution without you.»
   «All right, let's try and remain calm here, shall we? We both want the same thing: Penny's killer behind bars.»
   «We do indeed. I'm perfectly calm, and I'm also waiting.»
   «I'd like a minute to myself.»
   «Confer with whoever you want. You're not going anywhere.»
   He glowered, then pressed his fingertips to his temple, concentrating hard.
   Despite my initial misgivings I was becoming impatient for my symbionts to start working. What must it be like to call on friends and colleagues for support whenever you wanted? Must do wonders for the ego.
   My gaze wandered round the office. Standard corporate glitz; tastefully furnished in some Mexican/Japanese fusion, expensive art quietly on show. It seemed all very cold and functional to me. I stared at a picture on the wall behind Harwood. Surely it must be a copy? But then again I couldn't imagine Harwood settling for copies of Picasso.
   He surfaced from his trance, shaking his shoulders about like a wrestler preparing for a difficult grapple. «OK, why don't we take a hypothetical situation.»
   I groaned, but let it pass.
   «If an independent nation were to nationalize the property of a company which was in its domain, the international courts would disallow the legality of the move, and seize the assets of that nation as compensation for the owners. There was a rock-solid precedent set in the Botswana case of 2024; when Colonel Matomie's new government confiscated the Stranton corp's car factory. Colonel Matomie thought he was in a nineteen-sixties timewarp, back when all the new ex-colonial governments were grabbing any foreign asset for themselves. Stranton hauled him into the UN International Court; it took them a couple of years, but the ruling was unequivocally in their favour. The factory was their property, and Matomie's government was guilty of theft. Stranton applied for a sequestration injunction. Botswana's airliners were impounded as soon as they touched down on foreign soil, power from South Africa's grid was shut off, all non-humanitarian imports were embargoed. Matomie had to back down and return the factory. Ever since then, Marxist regimes have had a real problem nationalizing foreign enterprises. Sure, there's nothing to stop them from harassing the workforce, or shut businesses down with phoney health regulations, impose ludicrous taxes, or simply refuse to grant operating licences. But they can't own the property, not if the original owners don't want to sell.»
   «Yes, I can see how that would cause problems for you people. The only bona fide economic asset out here is the He3 mining operation. Even if the people of Eden declared independence there's nothing to stop the JSKP from housing its workers in another habitat. Eden by itself would become financially unviable; you couldn't compete in the microgee industry market because of the transport costs. Anything you build can also be built in the O'Neill Halo, and for far less. You have to have the mining operation as well as the habitat if you are to succeed.»
   Harwood gave an indifferent shrug. «So you say. But my hypothetical government already has a small stake in the foreign factory it wants to take into national ownership. That changes the entire legal ball game; the whole concept of ownership and rights becomes far more ambiguous.»
   «Ah!» I clicked my fingers as the full realization hit me. «You're going to engineer a leveraged buyout from the existing shareholders, and probably try to oust the existing board members as well. No wonder you need all that money.» I stopped, recalling the briefing files I'd studied on the JSKP. «But even that can't be enough. You only have a few billion available. JSKP is a multi-trillion-wattdollar venture; it won't break even for another fifty years.»
   «No government on Earth is going to disrupt the flow of goods from this hypothetical nationalized factory. They can't afford to, the product it manufactures is unique and extraordinarily valuable. Ultimately, the courts and the financial community will permit this proposed managerial restructuring, especially as full compensation will be paid. Nobody is trying to cheat anyone out of anything. A large proportion of the money which Penny and other philanthropists have pledged to this hypothetical government will be spent on legal battles; which are shaping up to be very violent and depressingly prolonged.»
   «Yes, I see now.» I stood up. «Well, providing I can verify this hypothesis , I think you and the other trustees can be removed from my suspect list. Thank you for your time.»
   Harwood lumbered to his feet. «I hope you find Penny's killer soon, Chief Parfitt.»
   «I'll do my best.»
   «Yeah, I guess so.» His expression turned confidently superior. «But don't count on having too much time. You might just find you ain't gonna be here for very much longer.»
   I stopped in the open door, and gave him a genuinely pitying look. «Do you really think that Boston won't need a professional police force if you ever do manage to form a government here? If so, you're more of a daydreaming fool than I thought.»
 
   • • •
 
   Pieter Zernov was a lot more cordial than Harwood; but then we'd got to know each other quite well on the Ithilien . A modest man, quietly intelligent, who kept most of his opinions to himself; but when he did talk on a subject which interested him he was both coherent and well informed. It was his nomination as a trustee which made me inclined to believe Harwood's explanation about what Boston intended to do with the money. I trusted Pieter, mainly because he was one person who couldn't have killed Penny. The way it looked at the moment, the murderer had to have been in the habitat for at least a couple days prior to the murder.
   A time when Pieter was on the Ithilien with me. Good alibi.
   I found him in the JSKP's Biotechnology Division headquarters, supervising Ararat's germination.
   «It ought to be Penny doing this,» he said mournfully. «She put in so much work on Ararat, especially after her accident. It's a tremendous improvement on Eden and Pallas.»
   We were standing at the back of a large control centre; five long rows of consoles were arrayed in front of us, each with technicians scanning displays and issuing streams of orders to their equipment. Big holoscreens were fixed up around the walls, each showing a different view of Ararat as the large seed floated fifteen kilometres distant from Eden. The foam which protected it during the flight from the O'Neill Halo had been stripped away, allowing the base to be mated to a large support module.
   «It looks like an old-style oil refinery,» I said.
   «Not a bad guess,» Pieter said. «The tanks all hold hydrocarbon compounds. We'll feed them into the seed over the next two months. Then if we're happy that the germination is progressing normally, the whole thing gets shifted to its permanent orbital location, leading Eden by a thousand kilometres. We have a suitable mineral-rich rock there waiting for it.»
   «And Ararat will just start eating it?»
   «Not quite, we have to process the raw material it consumes for a further nine months, until its own absorption and digestion organs have developed. After that it'll be attached directly onto the rock. We are hoping that the next generation habitats are going to be able to ingest minerals straight out of the ore right from the start.»
   «From tiny acorns,» I murmured.
   «Quite. Although, this isn't one unified seed like you have for trees. Habitat seeds are multisymbiotic constructs; we don't know how to sequence the blueprint for an entire habitat into a single strand of DNA. Not yet, anyway. And, regrettably, biotechnology research is slowing down on Earth, there's too much association with affinity. That's why Penny was so keen to move her company out here, where she could work without interference.»
   «Speaking of which . . .»
   He bowed his head. «Yes, I know. Her will.»
   «If you could just confirm what Antony Harwood told me.»
   «Oh, Antony. You shook him up rather badly, you know. He's not used to being treated like that. His employees are a great deal more respectful.»
   «You were hooked in?»
   «Most of us were.»
   I found I quite liked that idea, silent witnesses to Mr Front knuckling under at the first touch of pressure. Most unprofessional, Harvey. «The will,» I prompted.
   «Of course. What Antony told you is more or less true. The money will be channelled into fighting legal cases on Earth. But we're aiming for more than just a leveraged buyout, that would simply entail replacing the current JSKP board members with our own proxies. Boston wants the He3 mining industry to be owned collectively by Eden's residents. We're prepared to purchase every share in the enterprise, even though it will take decades, maybe even a century, to pay off the debt. If Eden's independence is to be anything other than a token, we must be in complete control of our own destiny.»
   «Thank you.» I could sense how much it hurt him to talk about it, especially to someone like me. Yet he was proud, too. When he talked of «Boston» and «us», I could see he was totally committed to the ideal. What a strange umbrella organization it was; you could hardly find two more disparate people than Pieter Zernov and Antony Harwood.
   «I'm rather honoured Penny named me,» he said. «I hope I live up to her expectations. Perhaps she wanted one moderate voice to be heard. I do tend to feel slightly out of place amongst all these millionaire power players. Really, I'm just a biotechnology professor from Moscow University on a three-year sabbatical with the JSKP. Think of that, a Muscovite living in a tropical climate. My skin peels constantly and I get headaches from the axial light-tube's brightness.»
   «Will you be going back?»
   He gave me a long look, then shook his head ponderously. «I don't think so. There is a lot of work to be done here, whatever the outcome. Even the JSKP has offered me a permanent contract. But I would like to teach again some day.»
   «What's the appeal, Pieter? I mean, does the composition of the JSKP board membership really make that much difference? People here at Jupiter are still going to live and work in the same conditions. Or are you that committed to the old collective ideal?»
   «You ask this of a Russian, after all we've been through? No, it's more than a blind grasp for collectivism in the name of workers' liberation. Jupiter offers us a unique opportunity; there are so many resources out here, so much energy, if it can be harvested properly we can build a very special culture. A culture which thanks to affinity will be very different from anything which has gone before. That chance to do something new happens so rarely in human history; which is why I support the Boston group. The possibility, the fragile hope, cannot be allowed to wither; any inaction on my part would be criminal, I could never live with the guilt. I told you the next generation of habitats will be able to ingest minerals right away; but they are also capable of much, much more. They will be able to synthesize food in specialist glands, feed their entire population at no cost, with no machinery to harvest or prepare or freeze. How wonderful that will be, how miraculous. The polyp can be grown into houses, into cathedrals if you want. And our children are already showing us how innately kind and decent people can be when they grow up sharing their thoughts. You see, Harvey? There is so much potential for new styles of life here. And when you combine it with the sound economic foundation of the He3 mining, the possibilities become truly limitless. Biotechnology and super-engineering combining synergistically, in a way they have never been allowed to do back on Earth. Even the O'Neill Halo suffers limits imposed by fools like the Pope, and restrictions issued by its own jealous population, fearful of changing the status quo, of letting in the masses. That would not happen here, Harvey, out here we can expand almost without limit. This is the frontier we have lacked for so long, a frontier for both the physical and spiritual sides of the human race.»
   Despite myself (I should say my official self), I couldn't help feeling a strong admiration for Boston and its goals. There's something darkly appealing about valiant underdogs going up against those kind of odds. And don't be fooled into thinking anything else, the odds were huge , the corporations wielded an immense amount of power, most of it unchecked. International courts could be bought from their petty-cash funds. It started me thinking again about the possibility that Penny Maowkavitz was deliberately eliminated. Her death, particularly now, was terribly convenient for JSKP.
   Pieter had been right about one thing, though, Eden was a special entity; the nature of the society which was struggling to emerge out here was as near perfect as I was ever likely to see. Its people deserved a chance. One where they weren't squeezed by the JSKP board to maximize profits at the expense of everything else.
   «You talk a great deal of sense,» I told him ruefully.
   His meaty hand gripped my shoulder, squeezing fondly. «Harvey, what you said to Antony came as a surprise to many of us. We were expecting the JSKP to appoint someone . . . shall we say, more dogmatic as Chief of Police. I would just like to say that Antony does not have a deciding vote, we are after all attempting to build an egalitarian democracy. So for what it's worth, we welcome anyone who wishes to stay and do an honest day's work. Because unfortunately I suspect you were right; people are going to need policemen for a long time to come. And I know you are a good policeman, Harvey.»
 
   • • •
 
   I made the effort to get home for lunch. I don't think I'd spent more than a couple of hours with the twins since we arrived.
   We ate at a big oval table in the kitchen, with the patio doors wide open, allowing a gentle breeze to swim through the room. There were no servitor chimps in sight. Jocelyn must have prepared the food herself. I didn't ask.
   Nathaniel and Nicolette both had damp hair. «We've been swimming in the circumfluous lake at the southern endcap,» Nathaniel told me eagerly. «We caught a monorail tram down to a water sports centre in one of the coves. They've got these huge slides, and waterfalls where the filter organs vent out through the endcap cliff, and jetskis. It's great, Dad. Jesse helped us take out a full membership.»
   I frowned, and glanced up at Jocelyn. «I thought they were due in school.»
   «Dad,» Nicolette protested.
   «Next week,» Jocelyn said. «They start on Monday.»
   «Good. Who's Jesse?»
   «Friend of mine,» Nathaniel said. «I met him at the day club yesterday. I like the people here; they're a lot easier going than back in the arcology. They all know who we are, but they didn't give us a hard time about it.»
   «Why should they?»
   «Because we're a security chief's children,» Nicolette said. I think she learnt that mildly exasperated tone from me. «It didn't make us real popular back in the Delph arcology.»
   «You never told me that.»
   She made a show of licking salad cream off her fork. «When did you ask?»
   «Oh, of course, I'm a parent. I'm in the wrong. I'm always in the wrong.»
   Her whole face lit up in a smile. For the first time I realized she had freckles.
   «Of course you are, Daddy, but we make allowances. By the way, can I keep a parrot, please? Some of the red parakeets I've seen here are really beautiful, I think they must be gene-adapted to have plumage like that, they look like flying rainbows. There's a pet shop in the plaza just down the road which sells the eggs. Ever so cheap.»
   I coughed on my lettuce leaf.
   «No,» Jocelyn said.
   «Oh, Mum, it wouldn't be affinity bonded. A proper pet.»
   «No.»
   Nicolette caught my eye and screwed her face up.
   «How's the murder case coming on?» Nathaniel asked. «Everyone at the lake was talking about it.»
   «Were they, now?»
   «Yes. Everyone says Maowkavitz was an independence rebel, and the JSKP had her killed.»
   «Is that right, Dad?» Nicolette looked at me eagerly.
   Jocelyn had stopped eating, also focusing on me.
   I toyed with some of the chicken on my plate. «No. At least, not all of it. Maowkavitz was part of a group discussing independence for Eden; people have been talking about that for years. But the company didn't kill her. They've had plenty of opportunities during the last few years to eliminate her if they wanted to, and make it seem like an accident. She was back on Earth eighteen months ago, if the JSKP board wanted her dead, they would've had it done then, and nobody would have questioned it. Her very public murder up here is the last thing they need. For a start, they're bound to be considered as prime suspects, by public rumour if not my department. It will inevitably make more people sympathetic to her cause.»
   «Have you got a suspect, then?» Nathaniel asked.
   «Not yet. But the method indicates that it's just one person, acting alone. There was a large amount of very secretive preparation involved. It has to be someone who's clever, above-average intelligence, familiar with Eden's biotechnology structure, and also the cybersystems, we think. Unfortunately that includes about half of the population. But the murderer must have an obsessive personality as well, which isn't so common. Then there's the risk to consider; even with the method they came up with—which admittedly is very smart—there was still a big chance of discovery. Whoever did it was prepared to take that risk. This is one very cool customer, because murder up here is a capital crime.»
   «The death penalty?» Nicolette asked, her eyes rounded.
   «That's right.» I winked. «Something to think about when you're considering joyriding one of the jeeps.»
   «I wouldn't!»
   «What about a motive?» Nathaniel persisted. Tenacious boy. I wonder where he got it from?
   «No motive established so far. I haven't compiled enough information on Maowkavitz yet.»
   «It's got to be personal,» he said decisively. «I bet she had a secret lover, or something. Rich people always get killed for personal reasons. When they fight about money they always do it in court.»
   «I expect you're right.»
 
   • • •
 
   One thing all Penny Maowkavitz's nominees had in common, they were industrious people. I caught up with Bob Parkinson in the offices of the He3 mining mission centre, the largest building in Eden, a four-storey glass and composite cube. An archetypal company field headquarters, the kind of stolid structure designed to be assembled in a hurry, and last for decades.
   His office didn't have quite the extravagance of Harwood's, it was more how I imagined the study of a computer science professor would look like. The desk was one giant console, while two walls were simply floor to ceiling holoscreens displaying orbital plots and breathtaking views of Jupiter's upper cloud level, relayed directly from the aerostats drifting in the gas-giant's troposphere. A hazed ochre universe that went on for ever, flecked by long streamers of ammonia cirrus that scudded past like a time-lapse video recording. The JSKP currently had twenty-seven of the vast hot-hydrogen balloons floating freely in the atmosphere; five hundred metre diameter spheres supporting the filtration plant which extracted He3 from Jupiter's constituent gases, and liquified it ready for collection by robot shuttles.
   He3 is one of the rarest substances in the solar system, but it holds the key to commercially successful fusion. The first fusion stations came on-line in 2041, burning a mix of deuterium and tritium; second-generation stations employed a straight deuterium–deuterium reaction. Those combinations have a number of advantages: ignition is easy, the energy release is favourable, and the fuels are available in abundance. The major drawback is that both reactions are neutron emitters. Although you can use this effect to breed more tritium, by employing lithium blankets, it's a messy operation, requiring more complex (read: expensive) reactors, and a supplementary processing facility to handle the lithium. Without lithium blankets the reactor walls become radioactive, then have to be disposed of; and you require additional shielding to protect the magnetic confinement system. The costs in both monetary and environmental terms weren't much of an improvement on fission reactors.
   Then in 2062 the JSKP dropped its first aerostat into Jupiter's atmosphere, and began extracting He3 in viable quantities. There are only minute amounts of the isotope present in Jupiter. But minute is a relative thing when you're dealing with a gas giant.
   The fusion industry—if you'll pardon the expression—went critical. Stations burning a deuterium–He3 mix produced one of the cleanest possible fusion reactions, a high-energy proton emitter. It also proved an ideal space drive, cutting down costs of flights to Jupiter, which in turn reduced the costs of shipping back He3 , which led to increased demand.
   An upward spiral of benefits. He3 was every economist's fantasy commodity.
   Bob Parkinson was the man charged with ensuring a steady supply was maintained; a senior JSKP vice-president, he ran the entire mining operation. It wasn't the kind of responsibility I would ever want, but he appeared to handle it stoically. A tall fifty-year-old, with a monk's halo of short grizzled hair, and a heavily wrinkled face.
   «I was wondering when you were going to get round to me,» he said.
   «They told me it would have to be today.»
   «God, yes. I can't delay the lowering, not even for Penny. And I have to be there.» A finger flicked up to one of the screens showing a small rugby-ball-shaped asteroid which seemed to be just skimming Jupiter's cloud tops. Fully half of its surface was covered with machinery; large black radiator fins formed a ruff collar around one conical peak. A flotilla of industrial stations swarmed in attendance, along with several inter-orbit transfer craft.
   «That's the cloudscoop anchor?» I asked.
   «Yes. Quite an achievement; the pinnacle of our society's engineering prowess.»
   «I can't see the scoop itself.»
   «It's on the other side.» He gave an instruction to his desk, and the view began to tilt. Against the backdrop of salmon and white clouds I could see a slender black line protruding from the side of the asteroid which was tide-locked towards the gas giant. Its end was lost somewhere among the rumbustious cyclones of the equatorial storm band.
   «A monomolecule silicon pipe two and a half thousand kilometres long,» Bob Parkinson said with considerable pride. «With the scoop head filters working at full efficiency, it can pump a tonne of He3 up to the anchor asteroid every day. There will be no need to send the shuttles down to the aerostats any more. We just liquify it on the anchor asteroid, and transfer it straight into the tanker ships.»
   «At one-third the current cost,» I said.
   «I see you do your homework, Chief Parfitt.»
   «I try. What happens to the aerostats?»
   «We intend to keep them and the shuttles running for a while yet. They are very high-value chunks of hardware, and they've got to repay their investment outlay. But we won't be replacing them when they reach the end of their operational life. JSKP plans to have a second cloudscoop operational in four years' time. And, who knows, now we know how to build one, we might even stick to schedule.»
   «When do you start lowering?»
   «Couple of days. But the actual event will be strung out over a month, because believe me this is one hyper-complicated manoeuvre. We're actually decreasing the asteroid's velocity, which reduces its orbital height, and pushes the scoop down into the atmosphere.»
   «How deep?»
   «Five hundred kilometres. But the trouble starts when it begins to enter the stratosphere; there's going to be a lot of turbulence, which will cause flexing. The lower section of the pipe is studded with rockets to damp down the oscillations, and of course the scoop head itself has aerodynamic surfaces. Quantumsoft has come up with a momentum-command program which they think will work, but nobody's ever attempted anything like this before. Which is why we need a large team of controllers on site. The time delay from here would be impossible.»
   «And you're leading them.»
   «That's what they pay me for.»
   «Well, good luck.»
   «Thanks.»
   We stared at each other for a moment. Having to conduct a direct interview with someone who was technically my superior is the kind of politics I can really do without.
   «As far as we can ascertain at this point, Penny Maowkavitz didn't have any problems in her professional life,» I said. «That leaves us with her personal life, and her involvement with Boston. The motive for her murder has to spring from one of those two facets. You are one of the trustees named in her will, she obviously felt close to you. What can you tell me about her?»
   «Her personal life, not much. Everyone up here works heavy schedules. When we did meet it was either on JSKP business, or discussing the possibilities for civil readjustment. Penny never did much socializing anyway. So I wouldn't know who she argued with in private.»
   «And what about in the context of Boston? According to my information you're now its leader.»
   His tolerant expression cooled somewhat. «We have a council. Policies are debated, then voted on. Individuals and personality aren't that important, the overall concept is what counts.»
   «So you're not going to change anything now she's gone?»
   «Nothing was ever finalized before her death,» he said unhappily. «We knew why Penny had the views she did, and made allowances.»
   «What views?»
   It wasn't the question he wanted, that much was obvious. A man who took flying an asteroid in his stride, he was discomforted by simply having to recount the arguments that went on in what everyone insisted on describing to me as a civilized discussion forum.
   He ran his hands back through the hair above his ears, concern momentarily doubling the mass of creases on his face. «It's the timing of the thing,» he said eventually. «Penny wanted us to make a bid for independence as soon as the cloudscoop was operational. Six to eight weeks from now.»
   I let out a soft whistle. «That soon?» That wasn't in Zimmels's briefing. I'd gathered the impression they were thinking in terms of a much longer timescale.
   «Penny wanted that date because that way she'd still be alive to see it happen. Who can blame her?»
   «But you didn't agree.»
   «No, I didn't.» He said it almost as a challenge to me. «It's too soon. There's some logic behind it, admittedly. With an operating cloudscoop we can guarantee uninterrupted deliveries of He3 to Earth. It's a much more reliable system than sending the shuttles down to pick up fuel from the aerostats. Jupiter's atmosphere is not a benign environment; we lose at least a couple of shuttles each year, and the aerostats take a real pounding. But the cloudscoop—hell, there are virtually no moving parts. Once it's functioning it'll last for a century, with only minimal maintenance. And we have now established the production systems to keep on building new cloudscoops. So when it comes to He3 acquisition technology we're completely self-sufficient, we don't have to rely on Earth or the O'Neill Halo for anything.»