Justice: Those Who Kill

Five years ago, Alice Ejbye's 18-year-old son Markus was murdered by a serial killer who was never found; Alice is now seriously ill and asks criminal profiler, Louise Bergstein, the daughter of her best friend, to help solve the case.

A young man has been found in the woods, tortured and stabbed to death; Louise Bergstein and Karina Horup try to find evidence for whether the murder can be attributed to a serial killer who, after a five-year hiatus, may now be active again.

Louise and Karina know that William Fjeldby is the serial killer's victim, but his father clings to hope that he's alive; Johannes suspects his father's hiding something.

Alice offers a reward for information about who killed her son, but Karina and Louise struggle to find a useful tip; Peter takes his frustration out on his next victim.

Alice's death takes the investigation in a new direction; Karina gives Louise an ultimatum; Peter receives an offer from Leif; Johannes rebels against his father.

Karina and Louise return to the first victims to learn where they may have met their killer; Peter realizes the police are getting closer and happens to see Louise again.

Unaware of who he really was, Louise has spent a night with Peter; an earlier clue resurfaces, moving the case forward; Peter gives Johannes a hard message to accept.

The police take Johannes to the police station; Peter meets with his ex-wife, who has returned from Singapore; Karina, Soren, and Torben desperately try to find Peter.