Again, I went in first because I wanted to thoroughly survey the crime scene. Gallwey began photographing tool marks on the door and dusting for fingerprints, while I climbed inside and looked around as if I had never been there before. The small living area that normally would have contained a couch and table had been gutted and turned into a laboratory with sophisticated equipment that was neither new nor cheap.

The rabbit was still alive, and I fed him and set his cage on top of a counter neatly built of plywood and painted black. Beneath it was a refrigerator, and in it I found Vero and human embryonic lung fibroblast cells. They were tissue cultures routinely used for feeding poxviruses, just as fertilizers are used for certain plants. To maintain these cultures, the mad farmer of this mobile lab had a good supply of Eagle minimal essential medium, supplemented with ten percent fetal calf serum. This and the rabbit told me that deadoc was doing more than maintaining his virus, he was still in the process of propagating it when disaster had struck.

He had kept the virus in a liquid nitrogen freezer that did not need to be plugged in, but refilled every few months. It looked like a ten-gallon stainless steel thermos, and when I unscrewed the lid, I pulled out seven cryotubes so old that instead of plastic, they were made of glass. Codes that should have identified the disease were unlike anything I'd ever seen, but there was a date of 1978, and the location of Birmingham, England, tiny abbreviations written in black ink, neatly, and in lowercase. I returned the tubes of living, frozen horror to their frigid place, and rooted around more, finding twenty sample sizes of Vita facial spray, and tuberculin syringes that the killer, no doubt, had used to inoculate the canisters with the disease.

Of course, there were pipettes and rubber bulbs, petri dishes, and the flasks with screw caps where the virus was actually growing. The medium inside them was pink. Had it begun to turn pale yellow, the PH balance would indicate waste products, acidity, meaning the virus-laden cells had not been bathed in their nutrient-rich tissue culture medium in a while.

I remembered enough from medical school and my training as a pathologist to know that when propagating a virus, the cells must be fed. This is done with the pink culture medium, which must be aspirated off every few days with a pipette, when the

nutrients have been replaced by waste. For the medium still to be pink meant this had been done recently, at least within the last four days. Deadoc was meticulous. He had cultivated death with love and care. Yet there were two flasks broken on the floor, perhaps due to an infected rabbit hopping about, somehow accidentally out of its cage. I did not sense suicide here, but an unforeseen catastrophe that had caused deadoc to run.

Slowly, I moved around some more, through the kitchen, where a single bowl and fork had been washed and neatly left to dry on a dish towel by the sink. Cupboards were orderly, too, with rows of simple spices, boxes of cereal and rice and cans of vegetable soup. In the refrigerator was skim milk, apple juice, onions and carrots, but no meat. I closed the door as my mystification grew. Who was he? What did he do in this camper day after day besides make his viral bombs? Did he watch TV? Did he read?

I began to look for clothes, pulling open drawers with no luck. If this man had spent a lot of time here, why had he nothing to wear except what he had on? Why no photographs or personal mementoes? What about books, catalogues for ordering cell lines, tissue cultures, reference material for infectious diseases? Most obvious of all, what had happened to the vehicle that had towed this? Who had driven off in it and when?

I stayed in the bedroom longer, the carpet black from blood that had been tracked through other rooms when we had removed the body. I could not smell or hear anything but air circulating in my suit as I paused to change my four-hour battery. This room, like the rest of the camper, was generic, and I pulled back the flower- printed spread, discovering the pillow and sheets on one side were wrinkled from having been slept on. I found one short gray hair, and collected it with forceps as I remembered that the dead man's hair was longer and black.

A print of a seaside on the wall was cheap, and I took it down to see if I could tell where it had been framed. I tried the love seat beneath a window on the other side of the bed. It was covered in bright green vinyl, and on top was a cactus plant that had to be the only thing alive in the camper except for what was in the cage, the incubator and the freezer. I stirred the soil with my finger and it was not too dry, then I placed it on the carpet and opened up the love seat.

Based on cobwebs and dust, no one had been inside in many years, and I sifted through a rubber cat toy, a faded blue hat and a chewed-on corncob pipe. I did not sense that any of this belonged to the person who lived here now, or had even been noticed by him. I wondered if the camper had been used or in the family, and got down on my hands and knees and crawled around until I found the shot shell and the wad. These, too, I sealed inside an evidence bag.

Lucy was just sitting down at the laptop computer when I returned to the laboratory area.

'Screen saver password,' she said into her voice-activated microphone.

'I was hoping you'd get something difficult,' I said.

She was already rebooting and going into DOS. Knowing her, she would have that password removed in minutes, as I' d seen her do before.

'Kay,' Gallwey's voice sounded inside my hood. 'Got something good out here.'

I went down the steps, careful to keep my air line from tangling. He was in front of the camper, squatting by the area of the tongue where the VIN had been obliterated. Having polished the metal mirror-smooth with fine grit sandpaper, he was now applying a solution of copper chloride and hydrochloric acid to dissolve scarred metal

and restore the deeply stamped number underneath that the killer thought he had filed away.

'People don't realize how difficult it is to get rid of one of these things,' his voice filled my ears.

'Unless they're professional car thieves.' I said.

'Well, whoever did this didn't do a very good job.' He was taking photographs. 'I think we got it.'

'Let's hope the camper's registered,' I said.

'Who knows? Maybe we'll get lucky.'

'What about prints?'

The door and aluminum around it were smudged with black dusting powder.

'Some, but God knows whose,' he said getting up and straightening his back. 'In a minute, I'll tear up the inside.'

Meanwhile, Lucy was tearing up the computer, and like me, not coming up with anything that might tell us who deadoc was. But she did find files he had saved of our conversations in the chat rooms, and it was chilling to see them on screen, and wonder how often he had reread them. There were detailed lab notes documenting the propagation of the virus cells, and this was interesting. It appeared work had begun as recently as early in the fall, less than two months before the torso had turned up.

By late afternoon, we had done all we could do with no startling revelations. We took chemical showers as the camper was blasted with formalin gas. I stayed in my army- green house clothes because I did not want my suit after what it had been through.

'Kind of hell on your wardrobe,' Lucy commented as we left the changing room.

'Maybe you should try pearls with that. Dress it up a little.'

'Sometimes you sound like Marino,' I said.

Days crept into the weekend, and next I knew that was gone too with no developments that were anything but maddening. I had missed my mother's birthday. Not once had it crossed my mind.