Burned-out forensic profiler Dr. Tony Hill is called in to track a vicious killer across northern Europe, a case that he reluctantly takes on when the next victim is an old friend and that is soon complicated by his emperiled former partner, Detective Carol Jordan, in Germany to work undercover to expose a conspiracy whose roots lie deep in the tormented past of Nazi atrocities and Stasi abuses. Coming to terms over her breakup with criminal profiler Dr. Tony Hill, Chief Inspector Carol Jordan plunges into a risky undercover sting: track down a European drug trafficker and gain his confidence. But she's being tracked as well, by a serial killer whose psychosexual madness is born out of the darkest corners of history. In quiet isolation, Tony Hill is laying to rest the scars of his past, until he's recruited back into business on a case he can't ignore. An evil is striking uncomfortably close to home, and casting a killer shadow over the life of his long-time colleague and sometimes lover. As the danger closes in, and as Tony and Carol cross paths to navigate the terrain of a shattered human mind, they have no one left to trust but themselves, and fear that there's no place left to run as a killer promises to fulfill his most twisted dreams.