Iris is in Stockholm to identify a suspect for Christian's murder. Her former colleague Adam gets into trouble when Iris goes too far and gets involved in the investigation. The Benjamin case is packed up and placed once more on the shelf.

End of season. Iris can't let go of the Benjamin case and all of a sudden several pieces fall into place. Can the case be solved after all, after all these years? Kattis makes Iris realize the truth about Christian and the sisters reevaluate their relationship.