As the Nazis roll into Warsaw, a serial killer is unleashed. Former chief investigator Jan Kalisz lives a dangerous double life, forced to work with the occupiers as he gathers information for the fledgling Polish resistance. Even his family cannot be told his true allegiance. When the niece of a Wehrmacht general is found terribly mutilated, Jan links the murder to other killings that are of less interest to his new overlords. Soon, he finds himself on the trail of a psychopathic killer known as The Artist.