The documentary tells the story of Chief Justice Inspector Friedrich Kellner ( ) who wrote a secret diary during World War II. The diary records the crimes of the Nazis. The movie uses interviews, historical footage, and re-enactments of events to tell how Friedrich Kellner risked his life to write the diary. The story is also about Kellner’s American grandson, Robert Scott Kellner, who was abandoned as a child but later found his grandfather in Germany. Part of the movie is about the grandson’s attempt to bring the Friedrich Kellner diary to the attention of the public.