Based on the Danish TV crime series inspired by bestselling author Elsebeth Egholm, "Those Who Kill" stars Chloë Sevigny as Catherine Jensen, a brilliant police detective who tracks down serial killers. Jensen is also investigating her stepfather, who may be a serial killer, while searching for her missing brother. She enlists the help of Thomas Schaffer (James D’Arcy), a forensic psychiatrist, to help her understand the minds of serial killers, all the while luring Schaffer into her own personal investigation. Both characters possess a deep psychological understanding that connects them to the killers' victims and to the killers themselves.