Quickly Richards called up the monitor for the sentry post on L3. A broad mural of blood was on the wall; the sentry, Davis, was slumped on the floor below it, his face pressed to the tiles, as if he were probing the ground for a lost contact. A second soldier stepped into view and Richards saw that it was Paulson, holding a .45. Behind him, the doors to the elevator stood open. Paulson looked straight into the camera as he holstered the gun and removed the grenade from his pocket, then two more. He pulled the pins, using his teeth, and rolled them into the elevator. Then he took one more look at Richards, who saw his empty eyes, drew the .45, raised it to the side of his head, and pulled the trigger.

Richards reached for the switch to seal the level, but it was too late. He heard the explosion, ripping through the elevator shaft, and then a second blast of sound as what was left of the car went sailing to the bottom, and all the lights went out.

At first Wolgast didn’t know what he was hearing; the sound of the alarm was so sudden, so completely alien, that for a moment it obliterated all thought. He rose from his chair beside Amy’s bed and tried the door, but of course it wouldn’t open; they were sealed inside. The alarm rang and rang. A fire? No, he reasoned, over the din in his ears, it was something else, something worse. He looked up at the camera where it hung in the corner.

“Fortes! Sykes, goddamnit! Open this door!”

He heard the pop of automatic-weapon fire, muffled by its passage through the thick walls. For an instant he thought hopefully of rescue. But of course that was out of the question; who would rescue them?

And then, before he could generate another thought, there was a great concussive bang, and a terrible roar that ended in a second bang, louder than the first, bringing with it a deep, sonorous trembling, like an earthquake, and the room plunged into darkness.

Wolgast froze. The blackness was total, an overwhelming absence of light, completely disorienting. The alarms had stopped. He felt a blind urge to run, but there was nowhere to go. The room seemed to expand and to be closing in upon him, all at once.

“Amy, where are you? Help me find you!”

Silence. Wolgast drew a deep breath and held it. “Amy, say something. Say anything.”

He heard, behind him, a soft moan.

“That’s it.” He turned, listening hard, trying to calibrate the distance and direction. “Do it again. I’ll find you.”