Six months after young Julie Vinding disappeared from a Copenhagen suburb, investigator Jan Michelsen is the only one who believes that she is still alive. He unearths a ten-year-old case from the same neighbourhood in which 17-year-old girl Natasha disappeared on her way home from a party. Jan finds her remains in a lake and suspects a link between the two cases so brings in an expert on serial killers, Louise Bergstein.
Jan and Louise’s investigation into Natasha’s death leads them to suspect Anders Kjeldsen, a man who has been arrested before for violent crimes including rape. Trapped in a basement, Emma tries to comfort a traumatised Julie, but soon needs comforting herself.
Jan and Louise find an unsolved murder case in Sweden that is similar to Natasha’s, but in this one the victim’s ring finger was cut off. Louise doesn’t believe that the murder was committed by Anders Kjeldsen. Meanwhile, on a farm that Anders Kjeldsen stayed at as a child, the police find three women, all of whom have had their fingers cut off. Stine is forced to help Anders with the women in the basement who are planning to escape.
Louise realises that Anders Kjeldsen does not kill alone but has a partner who is the dominant of the two. In the basement, Emma tries to persuade Stine to help her to escape.
Jan and Louise find a dress belonging to Natasha, the first victim, which Anders Kjeldsen had hidden. That same night, Anders tries to kidnap another woman. Stine Velin attends her big brother Mikkel’s 40th birthday party and reveals a dark family secret.
The public appeal for information on Anders Kjeldsen leads to the identification of the third victim from the farm and an explanation of how all the women met their killer. Louise suspects that he has a female accomplice.
Stine Velin is taken into police custody but denies any guilt, insisting that she is also one of Anders Kjeldsen’s victims and does not know where either Anders or Emma have gone.
Jan and Louise find a body, and Louise is convinced that Stine’s family is in danger. The trail leads them to a safe house where the police have placed Stine’s parents and brother.