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When his mother dies, young Peter Ibbetson leaves Paris and his best friend, Mary, behind to live with a severe uncle in England. Years later, Peter (Gary Cooper) is an architect with little time for women, until he begins a project with the Duke (John Halliday) and Duchess of Towers (Ann Harding). When Peter and the duchess become great friends, she reveals that she is Mary -- but the duke soon suspects his wife of infidelity and challenges Peter to a duel, threatening the pair's second chance. Wikipedia