After she returns to her hometown to learn that her friend, Alex, was found in an ice-cold bath with her wrists slashed, biographer Erica Falck researches her friend's past in hopes of writing a book and joins forces with Detective Patrik Hedstrom, who has his own suspicions about the case.

When a young girl's body is pulled out of the harbor in the small Swedish resort town of Fjallbacka, Det. Patrik Hedström becomes the lead investigator as he struggles with lazy and inept colleagues and an even remoter-than-usual boss. It's his grim task to discover who could be behind the murder of the child both he and his partner Erica knew well.

Crime writer Erica Falck is shocked to discover a Nazi medal among her late mother's possessions. Haunted by a childhood of neglect, she resolves to dig deep into her family's past and finally uncover the reasons why. Her enquiries lead her to the home of a retired history teacher. He was among her mother's circle of friends during the Second World War but her questions are met with bizarre and evasive answers. Two days later he meets a violent death....