«We did consider that, but the circumstances weigh against it.» I thought of the chimp, the bag, putting the pistol together in stealthy increments, the sheer amount of effort involved. «No, it was too elaborate. That was a murder. Besides, surely Penny Maowkavitz would have had plenty of available options to kill herself that were a damn sight cleaner than this?»

«I would have thought so, yes. She had a whole laboratory full of methods to choose from. Although a bullet through the brain is one of the quickest methods I know. Penny was a very clever person, maybe she didn't want any time for reflection between an injection and losing consciousness.»

«Had she talked about suicide?»

«No, not to me; and normally I'd say she wasn't the suicide type. But she would know exactly what that last month was going to be like. You know, I've found myself thinking about it quite a lot recently; if I knew that was going to happen to me, I'd probably do something about it before I lost my faculties. Wouldn't you?»

It wasn't something I liked to think about. Christ. Even death from old age is something we manage to deny for most of our lives. Always, you'll be the marvel who lives to a hundred and fifty, the new Methuselah. «Probably,» I grunted sourly. «Who knew about her illness?»

«I'd say just about everyone. The whole habitat had heard about her accident.»

I sighed. «Everyone but me.»

«Oh, dear.» Corrine grinned impetuously. «Penny was exposed to a lethal radiation dose eight months ago. She was on a review trip to Pallas, that's the second habitat. It was germinated four years ago, and trails Eden's orbit by a thousand kilometres. Her division is responsible for overseeing the growth phase. And Penny takes her duty very seriously. She was EVA inspecting the outer shell when we had a massive ion flux. The magnetosphere does that occasionally, and it's completely unpredictable. Jupiter orbit is a radiative hell anyway; the suits which the crews here wear look more like deep-sea diving rigs than the kind of fabric pressure envelopes they use in the O'Neill Halo. But even their shielding couldn't protect Penny against that level of energy.» She leant back in the chair, shaking her head slowly. «That's one of the reasons I was chosen for this post, with my speciality. Those crews take a terrible risk going outside. They all have their sperm and ova frozen before they come here so they don't jeopardize their children. Anyway . . . the spaceship crew got her back here within two hours. Unfortunately there wasn't anything I could do, not in the long term. She was here in hospital for a fortnight, we flushed her blood seven times. But the radiation penetrated every cell, it was as if she'd stood in front of a strategic-defence X-ray laser. Her DNA was completely wrecked, blasted apart. The mutation—« Breath whistled painfully out of Corrine's mouth. «It was beyond even our gene therapy techniques to rectify. We did what we could, but it was basically just making her last months as easy as possible while the tumours started to grow. She knew it, we knew it.»