Frank witnesses how his 11-year-old stepdaughter Elsa is abducted by unknown kidnappers. The years pass and the kidnapping of Elsa remains an unsolved case. Almost two decades later, Frank, who himself has become suspicious, is mentally worn out and is considered a coward in the small community of Vargön.
When a young woman is reported missing, Frank is again subject to police suspicions. In one last desperate attempt to find out what really happened to Elsa and to clean himself from suspicions, he contacts Mona Schiller, who begins to dig in the old case. In her investigation, she soon discovers that strong forces are hiding beneath the surface of the small community. The search for the truth leads her along a path lined with fear, mistrust and religious fanaticism.