Starting a new job is never easy, but taking up her new role as head of Palladium Security Solutions' investigative department, Fox Meridian is left wondering whether she is really cut out for this one. Board meetings are boring, politics sets her teeth on edge, and there's no sign of a need for a detective anywhere.

But there's a serial killer working the elite set in Manhattan and one of Fox's few friends, Helen Dillan, is in Internal Affairs' sights for leaking sensitive crime scene information. They think she caught the wrong man, a man who claims he committed multiple murders because he was possessed by a demon, and that the original killer is at work again. It falls to Fox, Kit, and Dillan to uncover the truth, which is almost as strange as any demon possession could be.