Zach Adams is one of the best detectives in the country. Nicknamed Cowboy, he's a soft-spoken homicide detective from Houston 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 him, cursing him forever... transforming him into something deadly....