A family is found dead in their own home. Nothing has been stolen, and the killings seem pointless. Thomas Schaeffer takes on this mysterious case. During the investigation, another family is kidnapped and held captive in their own home.

A seventeen-year-old inmate of one of Denmark’s largest prisons is sexually assaulted and killed. Now, Katrine Ries Jensen is forced to revisit a past she’d rather forget. She attacks the system that enabled the assault.

A battered dead body is found. The homicide unit suspects a connection to an ongoing war between rivalling Eastern European drug gangs. Luckily, an officer is working undercover as a chauffeur for the Mafia boss Jacov.

A young woman is found dead by accident, seconds before she’s engulfed by the flames of the incinerator. Thomas and Katrine are faced with an investigation of what appears to be the perfect crime.

Thomas realises that he’ll never be able to combine a happy family life with being a forensic psychiatrist, so he gives his notice. But instead of working less, he is faced with the task of solving the biggest murder mystery in history.

Inspector Katrine Ries Jensen and forensic psychiatrist Thomas Schaeffer specialize in identifying serial killers who do not exhibit the traditional behavioral patterns of antisocial people.