Iris Broman moves from Stockholm to Ystad, living with her half-sister; she becomes manager of Malmö's Kalla Fall group; on her first day, a skull is found in the forest, launching an investigation.

The probe into the disappearance of Benjamin continues; Iris and Jens successfully find new leads, despite Kerstin's refusal to keep pursuing the case.

Iris gets furious when Katti's issues affect her; at work, the partnership with Kerstin sizzles, but Iris does not want the Benjamin case to slide; a medium reaches out to the police and states that there is a clue at the discovery site.

Iris goes to Stockholm to identify a suspect in the murder of Christian; Iris's former colleague Adam runs into trouble when she takes things too far and engages in the investigation; the Benjamin case wraps up and once again put on the shelf.

Iris is back in Malmö and continues the Benjamin case investigation; Iris gets into a fight with Kattis and goes to a hotel to be alone, but the memories of Christian haunt her.

Iris refuses to let go of the Benjamin case and suddenly various pieces fall into place; when Kattis helps Iris learn the truth about Christian, the sisters re-evaluate their relationship.