The paramedics loaded the stretcher into the ambulance. Dr. Solomons jumped into the back with the patient. They slammed the doors and roared off into the night.

Toni said, "Let me know what happens, Ruth. You can phone me on this headset."

Ruth's voice was already weakening with distance. "He's gone into a coma," she said. She added something else, but she was out of range, and her words became indistinguishable, then faded away altogether.

Toni shook herself to get rid of her gloomy torpor. There was work to be done. "Let's clean up," she said.

One of the men took a roll of yellow tape that read "Biohazard-Do Not Cross Line" and began to run it around the entire property, house and shed and garden, and around Michael's car. Luckily there were no other houses near enough to worry about. If Michael had lived in a block of flats with communal air vents, it would already have been too late for decontamination.

The others got out rolls of garbage bags, plastic garden sprayers already filled with disinfectant, boxes of cleaning cloths, and large white plastic drums. Every surface had to be sprayed and wiped down. Hard objects and precious possessions such as jewelry would be sealed in the drums and taken to the Kremlin to be sterilized by high-pressure steam in an autoclave. Everything else would be double-bagged and destroyed in the medical incinerator underneath the BSL4 lab.

Toni got one of the men to help her wipe Michael's black vomit off her suit and spray her. She had to repress an urge to tear the defiled suit off her body.

While the men cleaned up, she looked around, searching for clues as to why this had happened. As she had feared, Michael had stolen the experimental drug because he knew or suspected he had been infected with Madoba-2. But what had he done to expose himself to the virus?

In the shed there was a glass case with an air extractor, rather like an improvised biosafety cabinet. She had hardly looked at it before, because she was concentrating on Michael, but now she saw that there was a dead rabbit in the case. It looked as if it had died of the illness that had infected Michael. Had it come from the laboratory?

Beside it was a water bowl labeled "Joe." That was significant. Laboratory staff rarely named the creatures they worked with. They were kind to the subjects of their experiments, but they did not allow themselves to become attached to animals that were going to be killed. However, Michael had given this creature an identity, and treated it as a pet. Did he feel guilty about his work?

She stepped outside. A police patrol car was drawing up alongside the biohazard van. Toni had been expecting them. In accordance with the Critical Incident Response Plan that Toni herself had devised, the security guards at the Kremlin had automatically phoned regional police headquarters at Inverburn to notify them of a red alert. Now they were coming to find out how real the crisis was.

Toni had been a police officer herself, all her working life, until two years ago. For most of her career, she had been a golden girl-promoted rapidly, shown off to the media as the new style of modern cop, and tipped to be Scotland's first woman chief constable. Then she had clashed with her boss over a hot-button issue-racism in the force. He maintained that police racism was not institutionalized. She said that officers routinely concealed racist incidents, and that amounted to institutionalization. The row had been leaked to a newspaper, she had refused to deny what she believed, and she had been forced to resign.

At the time she had been living with Frank Hackett, another detective. They had been together eight years, although they had never married. When she fell out of favor, he left her. It still hurt.

Two young officers got out of the patrol car, a man and a woman. Toni knew most local police of her own generation, and some of the older ones remembered her late father, Sergeant Antonio Gallo, inevitably called Spanish Tony. However, she did not recognize these two. Over the headset, she said, "Jonathan, the police have arrived. Would you please decontaminate and talk to them? Just say we have confirmed the escape of a virus from the lab. They'll call Jim Kincaid, and I'll brief him when he gets here."

Superintendent Kincaid was responsible for what they called CBRN-chemical, biological, radiological, and nuclear incidents. He had worked with Toni on her plan. The two of them would implement a careful, low-key response to this incident.

By the time Kincaid arrived, she would like to have some information to give him about Michael Ross. She went into the house. Michael had turned the second bedroom into his study. On a side table were three framed photographs of his mother: as a slim teenager in a tight sweater; as a happy parent, holding a baby that looked like Michael; and in her sixties, with a fat black-and-white cat in her lap.

Toni sat at his desk and read his e-mails, operating the computer keyboard clumsily with her rubber-gloved hands. He had ordered a book called Animal Ethics from Amazon. He had also inquired about university courses in moral philosophy. She checked his Internet browser, and found he had recently visited animal-rights Web sites. Clearly, he had become troubled about the morality of his work. But it seemed no one at Oxenford Medical had realized that he was unhappy.

Toni sympathized with him. Every time she saw a beagle or a hamster lying in a cage, deliberately made ill by a disease the scientists were studying, she felt a tug of pity. But then she remembered her father's death. He had suffered a brain tumor in his fifties, and he had died bewildered, humiliated, and in pain. His condition might one day be curable thanks to research on monkey brains. Animal research was a sad necessity, in her opinion.

Michael kept his papers in a cardboard filing box, neatly labeled: "Bills," "Guarantees," "Bank Statements," "Instruction Manuals." Under "Memberships," Toni found an acknowledgment of his subscription to an organization called Animals Are Free. The picture was becoming clear.

The work calmed her distress. She had always been good at detective procedures. Being forced out of the police had been a bitter blow. It felt good to use her old skills, and know that she still had the talent.

She found Michael's address book and his appointments diary in a drawer. The diary showed nothing for the last two weeks. As she was opening the address book, a blue flash caught her eye through the window, and she looked out to see a gray Volvo sedan with a police light on its roof. That would be Jim Kincaid.

She went outside and got one of the team to decontaminate her. Then she took off her helmet to talk to the Superintendent. However, the man in the Volvo was not Jim. When his face caught the moonlight, Toni saw that it was Superintendent Frank Hackett-her ex. Her heart sank. Although he was the one who had left, he always acted as if he had been the injured party.

She resolved to be calm, friendly, and businesslike.

He got out of the car and came toward her. She said, "Please don't cross the line-I'll come out." She realized right away she had made an error of tact. He was the police officer and she was the civilian-he would feel that he should be giving orders to her, not the other way around. The frown that crossed his face showed her that he had felt the slight. Trying to be more friendly, she said, "How are you, Frank?"

"What's going on here?"

"A technician from the lab appears to have caught a virus. We've just taken him away in an isolation ambulance. Now we're decontaminating his house. Where's Jim Kincaid?"

"He's on holiday."

"Where?" Toni hoped Jim might be reached and brought back for this emergency.

"Portugal. He and his wife have a wee time-share."