Those Who Kill 4 - An eye for an eye

When the skeletons of four young women found buried in a forest north of Copenhagen pulled the ambitious and headstrong Deputy Superintendent Katrine Ries Jensen (Laura Bach) with the intellectual and humanly hostile legal psychiatrist Thomas Schaeffer (Jakob Cedergren) into a dangerous quest in the history of Denmark first serial killer. An offender who kills out of a pattern that is not readily explainable. Katrine and Thomas proves to be a strong, but mismatched couple whose approach and methods often differ from the conventional police investigation. Their search brings them close to the offender. So close to Katrine with his emotional and vengeful behavior unknowingly expose themselves to the offender and hence qualifies as the perfect next victim. For both Thomas and Katherine challenge will be to see the person behind the monster. For only when they understand the fantasies and traumas that operates the perpetrator, they are able to confront.

​​Looking for a perfect family, a serial killer plays a deadly game in which he tightens up the rules of the game and starts to kill as ​​someone refuses to play his game. ​​

A 17 year old inmate raped and killed in one of Denmark 's prisons . For Katrine being the case a strong meeting with a past she 'd rather forget , and she goes to attack the system that made the attack possible . When another prisoner killed in the same way , it becomes clear that a serial killer is loose behind bars. The case attracted great attention in the press , and the police receive massive criticism that such a thing at all can happen in a Danish prison . Have criminals less entitled to protection than others? Katrine and Thomas are working under intense pressure to narrow down the culprits in an environment marked by hatred, violence and revenge. An environment that penetrates under the skin of them both, and provokes sides they would rather not acknowledge .

A young woman's body is found by chance, seconds before she disappears forever in the flames of the incinerator. It seems that Thomas and Katrine are facing the investigation of the perfect murder.

Detective Katrine Ries Jensen and legal psychiatrist Thomas Schaeffer form a special unit at the Copenhagen Police investigating serial killings. A case from Schaeffer’s past crops up. As a young psychologist, he held back from sending a patient, who was manically drawing the details of a traffic accident, to a secure hospital. Now these bloody scenes resurface, enacted as real killings.