When a blood-soaked man is discovered with the word Baal-Berith scored into his flesh, the bewildered police call on expert Professor Matt Hunter to assist. Before long, a gruesome discovery is made and Hunter is drawn into a frenzied murder investigation.

With a fury of media interest in the case, and the emerging link to a documentary on demonic possession, Hunter is unable to escape a dark world of exorcism and violence ... even when events spiral frighteningly out of control.