Iris has found her feet as the head of the Cold Case group when a body is found buried outside Ystad. At the same time, a documentary film is being made about a similar case. Could the two be connected? Iris receives a message that has unexpected consequences.
Iris is threatened with suspension. A new boss is to be appointed and Kerstin feels ready to take over. When the documentary about Thorbjörn's disappearance is shown, it creates a stir for the Kalla fall group, as it ends with a startling promise.
Iris finally gets hold of Adam in Spain. Van Voorst is arrested, but the only person he wants to talk to is Iris. Jens feels pressured in his role as boss. During a memorial service at the manor, dark secrets are revealed and the dinner ends in disaster.
Sara has disappeared without a trace and an intensive search is underway. At the same time, the group investigates the two cold cases and becomes more and more convinced that they are connected. Iris is invited to dinner at Kerstin's and gets an unpleasant surprise.
Sara is found lifeless and taken to the emergency room, causing her mother to react in an unexpected way. An interview with Sara reveals new revelations about the family. At the same time, the group receives evidence that points to Thorbjörn's voluntary disappearance.
The new find in the forest is the beginning of the end. The Cold Case team gets answers to several of their questions and becomes increasingly convinced that they will succeed in solving the cases. Iris meets Van Voorst in the courtroom and hopes to see him convicted of her husband's murder.
