For the last 17 years, Christian Haberstaat has been trying to solve the murder of a young woman who was found hanging upside-down from a tree. He asks Carl Mrck for assistance, who, at first, pays him little mind. Soon after that, Haberstaat suddenly dies, followed a few days later by the death of his son. Mrck realizes he must now get involved. He moves with his assistants Rose and Assad to Bornholm Island in order to follow the clues. Little do they realize the danger they have just put themselves in.