Haakon Chevalier's diary is comprised of two hand-written notebooks kept during his time working as a French-English translator at the Nuremberg war crimes trials in 1945 and 1946, and a partial transcript of the notebooks' English-language portions. The diaries begin on the first day of the trial, November 20, 1945, and end on March 17, 1946. His account includes vivid descriptions of trial participants (including facial expressions while testifying, unusual physical features, and personality traits), and personal interpretations of testimony. He mentions challenges to the court's competence, pleas entered by the defendants, Nazi treatment of Jewish peoples in occupied territories, the Anschluss, and myriad other topics, including individual cases against Goering, Ribbentrop, Streicher, and others. Descriptions of day and weekend trips Chevalier took to Paris and Prague during the course of the trial are also included, as well as doodles, notes he wrote to himself, addresses, and scores from card games.