On a trip with her two children to the beach, Nora Linde discovers a body in the water; Inspector Thomas Andreasson is assigned the case and dismisses the initial assumption of drowning, suspecting murder.

Nora helps a friend on the police force investigate, which leads to a suspect and a jealous husband.

Nora's children go missing and she turns to her friend Signe for support.

Just as a boat crosses the finish line of an annual race, the captain is shot and collapses.

Crime detectives Thomas Andreasson and Mia Holmgren investigate the victim's family and work life.

As Nora contributes to the investigation as a consultant she realizes the killer is closer than anyone thinks.