A young girl, Sophia (Emily Matthews) spends the summer with her father (Anders Danielsen Lie) and grandmother (Glenn Close) on a small island in the Gulf of Finland, as the family grapples with the recent death of Sophia's mother.

At a Scandinavian psychiatric hospital, an uneasy triumvirate of multiple murderer Mads, therapist Anna, and policeman Soren all have a vested interest in unearthing the truth, and a deepening co-dependency threatens to consume them all.