It was the rat, in a way, which brought Blake Johnson not only awake, but back to life. Sitting on the stone seat in the darkness, up to his waist in water, it was astonishing that he'd drifted into sleep at all, and then he'd come awake, aware of something on his neck, and had sat up.

The light in the grilled entrance behind him gave enough illumination for him to see what it was that slid from his left shoulder. It splashed into the water, surfaced, and turned to look at him, nose pointing, eyes unwinking.

It took Blake back more than twenty-five years to when he'd been a young Special Forces sergeant at the end of the Vietnam War, up to his neck in a tidal swamp in the Mekong Delta, trying to avoid sudden death at the hands of the Vietcong. There had been rats there, too, especially because of the bodies.

No bodies here. Just the grille entrance with the faint light showing through, the rough stone walls of the tunnel, the strong, dank sewer smell, and the grille forty yards the other way, the grille that meant there was nowhere to go as he'd found when they had first put him into this place.

The rat floated, watching him, strangely friendly. Blake said softly, 'Now you behave yourself. Be off with you.'

He stirred the water, and the rat fled. He leaned back, intensely cold, and tried to think straight. He remembered coming to a kind of half-life in the Range Rover, the effects of the drugs wearing off. They'd come over a hill, in heavy rain, some sort of storm, and then in the lightning he'd seen cliffs below, a cruel sea, and above the cliffs a castle like something out of a fairy tale by the Brothers Grimm.

When Blake had groaned and tried to sit up, Falcone, the one sitting beside the driver, had turned and smiled.