When an attorney is found murdered with a note on his body, Peter Wendel hires Jorma and Caijsa, two cops who hate each other.

The media finds out about Peter's investigation; Peter hides his connection to the murder weapon; a missing pedophile becomes a suspect.

While Peter and Barbro hunt for the killer in Stockholm, Jorma and Caijsa search the pedophile's house; Ann-Marie realizes that the minister of justice is trying to influence the investigation.

Peter tries to talk to the minister of justice about the old murder cases; in Hallstavik, Jorma and Caijsa find the missing pedophile and expose a dark secret; a witness's testimony takes the investigation in an unexpected direction.

The cold-case group is forced to release their suspect; old conflicts between Jorma and Caijsa erupt; Peter's hatred for the minister of justice causes consequences for the team.

After being suspended, Peter continues to follow the suspect; Caijsa and Jorma secretly help Peter; Barbro investigates a mysterious past disappearance; Ann-Marie documents conspiracy within the justice department; Peter talks to the suspect.