The filmmaker discover a dark family secret, and starts interviewing. As the film goes on more and more is revealed about one of the three most important Norwegian Nazis during the Second Wold War. The film tells about his introduction to the Nazi milieu, and when he later becomes the police chief of Oslo, deciding the deportation of Jews, the torture of enemies and the collaboration of the German occupants. The film also tells the story of the assassination of Karl Marthinsen, decided by the Norwegian resistance.