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Captain Henry St. James (Alec Guinness) heads a ferryboat that regularly moves between Gibraltar and North Africa, and he has a different life in each location. In Gibraltar, he is married to Maud (Celia Johnson), a subdued and dedicated housewife. In Morocco, he has another wife, the tempestuous Nita (Yvonne De Carlo), who enjoys the fast-paced nightlife. Henry enjoys this arrangement, with neither woman knowing of the other, until both women become dissatisfied with their one-sided lives. Wikipedia