In a Copenhagen park an elderly woman is found dead. Though the case bears a striking resemblance to an unsolved homicide from over a decade ago, the police cannot find any connection between the two victims. Across town a group of young women are being hunted down. The attacks seem random, but could these brutal acts of violence be related ? Detective Carl Morck of Department Q is charged with solving the mystery. Back at headquarters, Carl and his team are under pressure to deliver results. Solving the case, however, is not their only concern. After a breakdown, their colleague Rose is struggling to deal with the ghosts of her past - a past seemingly connected to one of the division`s most sinister case-files. It is up to Carl, Assad and Gordon to unearth the dark and violent secret plaguing Rose before it is too late.