During a cold winter night in Stockholm a young man is found walking alongside a railway bridge. The hospital declares that he is suffering from hypothermia and legionella. They also discover a death certificate stating that the man has been dead for over seven years. The man was a victim of the serial killer Jurek Walter, who was arrested by Detective Inspector Joona Linna. Jurek Walter was convicted to forensic psychiatric care, a sentence served in total isolation. But where has this man been during all these years? Due to an unexpected testimony the case is reopened. Someone needs to get under Jurek's skin and fast.