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In 1936, Jakub Vilda was a championship professional boxer from Czechoslovakia. He was in Munich, battling his German rival Kurt Schaller, when his manager called off the match. Puzzled and angry, he returned to Prague to train for another match and to find a new manager. When he learns that the Nazis were pressuring his manager to get him to lose, he becomes even more upset. Meanwhile, his old girlfriend has left him for someone else, and he takes up with a German woman who is a popular actress in Czech films. At the time of the rematch, he wins with great difficulty, but he wins. Unfortunately, his new girlfriend was under orders from the German government to cause him to lose, and the results for her are fatal. This drama is directly based on actual events.