But it would be much worse if she turned out to be right.

An employee was absent without leave; he had lied about where he was going; and samples of the new drug were missing from the vault. Had Michael Ross done something that put him at risk of catching a lethal infection? The drug was still in the trial stage, and was not effective against all viruses, but he would have figured it was better than nothing. Whatever he was up to, he had wanted to make sure no one called at his house for a couple of weeks; and so he had pretended he was going to Devon, to visit a mother who was no longer alive.

Monica Ansari had said, The fact that someone lives alone doesn't make them a nutcase, does it? It was one of those statements that meant the opposite of what it said. The biochemist had sensed something odd about Michael even though, as a rational scientist, she hesitated to rely on mere intuition.

Toni believed that intuition should never be ignored.

She could hardly bear to think of the consequences if the Madoba-2 virus had somehow escaped. It was highly infectious, spreading fast through coughs and sneezes. And it was fatal. A shudder of dread went through her, and she pushed down on the accelerator pedal.

The road was deserted and it took only twenty minutes to reach Michael Ross's isolated home. The entrance was not clearly marked, but Toni remembered it. She turned into a short drive that led to a low stone cottage behind a garden wall. The place was dark. Toni stopped the van next to a Volkswagen Golf, presumably Michael's. She sounded her horn long and loud.

Nothing happened. No lights came on, no one opened a door or window. Toni turned off the engine. Silence.

If Michael had gone away, why was his car here?

"Bunny suits, please, gentlemen," she said.

They all climbed into orange space suits, including the medical team from the second van. It was an awkward business. The suit was made of a heavy plastic that did not easily yield or fold. It closed with an airtight zip. They helped one another attach the gloves to the wrists with duct tape. Finally they worked the plastic feet of the suits into rubber overboots.

The suits were completely sealed. The wearer breathed through a HEPA filter-a high efficiency particulate air filter-with an electric fan powered by a battery pack worn on the suit belt. The filter would keep out any breathable particles that might carry germs or viruses. It also took out all but the strongest smells. The fan made a constant shushing noise that some people found oppressive. A headset in the helmet enabled them to speak to one another and to the switchboard at the Kremlin over a scrambled radio channel.

When they were ready, Toni looked again at the house. Should someone glance out of a window now, and see seven people in orange space suits, he would think UFO aliens were real.

If there was someone in there, he was not looking out of any windows.

"I'll go first," Toni said.

She went up to the front door, walking stiffly in the clumsy plastic suit. She rang the bell and banged the knocker. After a few moments, she went around the building to the back. There was a neat garden with a wooden shed. She found the back door unlocked, and stepped inside. She remembered standing in the kitchen while Michael made tea. She walked quickly through the house, turning on lights. The Rembrandts were still on the living-room wall. The place was clean, tidy, and empty.

She spoke to the others over the headset. "No one home." She could hear the dejected tone of her own voice.

Why had he left his house unlocked? Perhaps he was never coming back.

This was a blow. If Michael had been here, the mystery could have Urn solved quickly. Now there would have to be a search. He might be anywhere in the world. There was no knowing how long it would take to find him. She thought with dread of the nerve-racking days, or even weeks, of anxiety.

She went back out into the garden. To be thorough, she tried the door of the garden shed. It, too, was unlocked. When she opened it, she caught the trace of a smell, unpleasant but vaguely familiar. It must be very strong, she realized, to penetrate the suit's filter. Blood, she thought. The shed smelled like a slaughterhouse. She murmured, "Oh, my God."

Ruth Solomons, the doctor, heard her and said, "What is it?"

"Just a minute." The inside of the little wooden building was black: there were no windows. She fumbled in the dark and found a switch. When the light came on, she cried out in shock.

The others all spoke at once, asking what was wrong.

"Come quickly!" she said. "To the garden shed. Ruth first."

Michael Ross lay on the floor, face up. He was bleeding from every orifice: eyes, nose, mouth, ears. Blood pooled around him on the plank floor. Toni did not need the doctor to tell her that Michael was suffering from a massive multiple hemorrhage-a classic symptom of Madoba-2 and similar infections. He was very dangerous, his body an unexploded bomb full of the deadly virus. But he was alive. His chest went up and down, and a weak bubbling sound came from his mouth. She bent down, kneeling in the sticky puddle of fresh blood, and looked closely at him. "Michael!" she said, shouting to be heard through the plastic of her helmet. "It's Toni Gallo from the lab!"

There was a flicker of intelligence in his bloody eyes. He opened his mouth and mumbled something.

"What?" she shouted. She leaned closer.

"No cure," he said. Then he vomited. A jet of black fluid exploded from his mouth, splashing Toni's faceplate. She jerked back and cried out in alarm, even though she knew she was protected by the suit.

She was pushed aside, and Ruth Solomons bent over Michael.

"The pulse is very weak," the doctor said over the headset. She opened Michael's mouth and used her gloved fingers to clear some of the blood and vomit from his throat. "I need a laryngoscope-fast!" Seconds later, a paramedic rushed in with the implement. Ruth pushed it into Michael's mouth, clearing his throat so that he could breathe more easily. "Bring the isolation stretcher, quick as you can." She opened her medical case and took out a syringe already loaded-with morphine and a blood coagulant, Toni assumed. Ruth pushed the needle into Michael's neck and depressed the plunger. When she pulled the syringe out, Michael bled copiously from the small hole.

Toni was swamped by a wave of grief. She thought of Michael walking around the Kremlin, sitting in his house drinking tea, talking animatedly about etchings; and the sight of this desperately damaged body became all the more painful and tragic.

"Okay," Ruth said. "Let's get him out of here."

Two paramedics picked Michael up and carried him out to a gurney enclosed in a transparent plastic tent. They slid the patient through a porthole in one end of the tent, then sealed it. They wheeled the gurney across Michael's garden.

Before getting into the ambulance, they now had to decontaminate themselves and the stretcher. One of Toni's team had already gotten out a shallow plastic tub like a children's paddling pool. Now Dr. Solomons and the paramedics took turns standing in the tub and being sprayed with a powerful disinfectant that destroyed any virus by oxidizing its protein.

Toni watched, aware that every second's delay made it less likely that Michael would survive, knowing that the decontamination procedure had to be followed rigorously to prevent other deaths. She felt distraught that a deadly virus had escaped from her laboratory. It had never occurred before in the history of Oxenford Medical. The fact that she had been right to make such a fuss about the missing drugs, and her colleagues had been wrong to play it down, was small consolation. Her job was to prevent this happening, and she had failed. Would poor Michael die in consequence? Would others die?