6:45 AM

THE snowplow moved slowly along the two-lane road in the dark. Carl Osborne's Jaguar followed it. Toni was at the wheel of the Jag, peering ahead as the wipers struggled to clear away the thickly falling snow. The view through the windshield did not change. Straight ahead were the flashing lights of the snowplow; on her near side was the bank of snow freshly shoveled up by the blade; on the off side, virgin snow across the road and over the moors as far as the car's headlights reached.

Mother was asleep in the back with the puppy on her lap. Beside Toni, Carl was quiet, dozing or sulking. He had told Toni that he hated other people driving his car, but she had insisted, and he had been forced to yield, as she had the keys.

"You just never give an inch, do you?" he had muttered before sinking into silence.

"That's why I was such a good cop," she replied.

From the back, Mother said, "It's why you haven't got a husband."

That was more than an hour ago. Now Toni was struggling to stay awake, fighting the hypnotic sway of the wipers, the warmth from the heater, and the monotony of the view. She almost wished she had let Carl drive. But she needed to stay in control.

They had found the getaway vehicle at the Dew Drop Inn. It contained wigs, false mustaches, and plain-lensed spectacles, obviously disguise materials; but no clues as to where the gang might be headed. The police car had stayed there while the officers questioned Vincent, the young hotel employee Toni had spoken to on the phone. The snowplow continued north, on Frank's instructions.

For once, Toni agreed with Frank. It made sense for the gang to switch cars at a location that was on their route, rather than delay their getaway with a diversion. Of course, there was always the possibility that they had foreseen how the police would think and deliberately chosen a location that would mislead pursuers. But in Toni's experience villains were not that subtle. Once they had the swag in their hands, they wanted to get away as fast as they could.

The snowplow did not stop when it passed stationary vehicles. There were two police officers in the cab with the driver, but they were under strict instructions to observe only, for they were not armed, and the gang were. Some of the cars were abandoned, others had one or two people inside, but so far none contained three men and a woman. Most of the occupied cars started up and fell in behind the snowplow, following the track it cleared. There was now a small convoy behind the Jaguar.

Toni was beginning to feel pessimistic. She had hoped by now to have spotted the gang. After all, by the time the thieves had left the Dew Drop Inn, the roads had been all but impassable. How far could they have got?

Could they have some kind of hideout nearby? It seemed improbable. Thieves did not like to go to earth close to the scene of the crime—quite the opposite. As the convoy moved north, Toni worried more and more that her guess was wrong, and the thieves might have driven south.

She spotted a familiar direction sign saying "Beach," and realized they must be near Steepfall. Now she had to put the second part of her plan into operation. She had to go to the house and brief Stanley.

She was dreading it. Her job was to prevent this kind of thing happening. She had done several things right: her vigilance had ensured that the theft was discovered sooner rather than later; she had forced the police to take the biohazard serious............