From Edgar Award-winning Andrew Klavan, a supernatural thriller about a good cop in the grips of an evil curse: the first in a trilogy about a crime-fighter on a quest to control the beast within. Zach Adams is one of the best detectives in the country. Nicknamed Cowboy, hes a soft-spoken homicide detective known for his integrity and courage under fire. He serves on a federal task force that has a single mission: to hunt down Dominic Abend, a European gangster who has taken over the American underworld. In a centuries-old forest under a full moon, a beast assaults Zach, cursing him forever. In the aftermath, he is transformed into something horriblesomething deadly. Now, the good cop has innocent blood on his hands. He has killedand will kill againin the form of a beast who cant be controlled or stopped. Before he can free himself, hes going to have to solve the greatest mystery of all: How can you defeat evil when the evil is inside you?