Dr Leo Benedikt is a forensic psychologist. He deals with what goes on in the minds of mentally abnormal lawbreakers. Whether Cara Horvath calls him in as an expert witness for the police or someone asks him for help in a private case: Leo knows that every crime originates in the psyche - and can therefore only be solved there. When he investigates a series of mysterious suicides, he comes across the opaque pharmaceutical company "Janus" - and is stunned when he realizes what is actually behind the suicides.