One man. One choice. Someone must die.

From #1 New York Times bestselling author Dean Koontz comes this pulse-pounding thriller that starts with a terrifying decision we all might face one day: Help—or run. Timothy Carrier is an ordinary guy. He enjoys a beer after work at his friend’s tavern, the eccentric customers and amusing conversations. But tonight is no ordinary night. The jittery man sitting beside him has mistaken Tim for someone else—and passes him an envelope stuffed with cash and the photo of a pretty woman. “Ten thousand now. You get the rest when she’s gone.”

Tim Carrier always thought he knew the difference between right and wrong, good and evil. But tonight everything he thought he knew—even about himself—will be challenged. For Tim Carrier is at the center of a mystery of extraordinary proportions, the one man who can save an innocent life and stop a killer as relentless as evil incarnate. But first he must discover resources within himself of which he never dreamed, capacities that will transform his idea of who he is and what it takes to be . . .