In a Copenhagen park, the body of an elderly woman is discovered. The case bears a striking resemblance to another unsolved homicide investigation from over a decade ago, but the connection between the two victims confounds the police. Across town, a group of young women are being hunted. The attacks seem random, but could these brutal acts of violence be related? Detective Carl Mørck of Department Q is charged with solving the mystery. Meanwhile, after an earlier breakdown, their colleague Rose is still struggling to deal with the reemergence of her past --- a past in which a terrible crime may have been committed. It is up to Carl, Assad and Gordon to uncover the dark and violent truth at the heart of Rose’s childhood before it is too late.