Following a shootout that left his two partners respectively dead and paralyzed, chief detective Carl Mørck is assigned to the newly established Department Q, a department for old, terminated cases. The department consists only of himself and his new assistant Assad. Although they get explicit orders to only read and sort through the cases, merely a single day passes before Carl’s stubborn nature throws them headfirst into the mystery of Merete Lynggaard’s disappearance; a well-known female politician who vanished five years ago from a passenger ferry.