The international bestseller Dean Koontz delivers a masterclass of storytelling suspense in this thriller. What would you do if a serial killer forced you to choose who he murders next?

On the windscreen of his SUV, Billy finds the first note. It gives him a choice. If he takes the note to the police, an elderly woman will be killed. If he doesn't approach the police, a schoolteacher will die. He thinks it's a hoax. The schoolteacher is killed. Further notes taunt Billy's conscience, forcing him to decide who lives and who dies.

He must think the unthinkable, fast, in an accelerating nightmare. More communications from the killer follow with ever tighter deadlines. Each is more personal, more confrontational than the last until he is isolated, with no one to rely on but himself.

Finally, he must risk everything to save the helpless, clueless victims...