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.
The police have a suspect but Nora continues to involve herself in the investigation. After a chance meeting with inspector Thomas, she gives information that seems to lead to new clues.
While preparing for a 40th wedding celebration, Nora's own children go missing at the beach. The search leads to a macabre discovery that pulls the case many years back through history.