Sofia Helin plays Iris Broman, the new head of the Kalla Fall, a group solving cold cases in Malmö. Due to a tragedy, she leaves Stockholm for the small southern town of Ystad, and moves in with her half-sister Kattis’ (Hedda Stiernstedt). There, a cold case becomes topical again and everything is turned upside down, intertwining the lives of several people.