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Richard (James Mason), a British naval commander, is dismissed from service after he acts on deadly false orders planted by his girlfriend, Mary (Pat Medina), who is actually a Nazi spy. Determined to find her and clear his reputation, Richard tracks Mary to a cottage, where he discovers her corpse a few moments before Laura (Joyce Howard), a woman investigating a Nazi spy ring, bursts in. Realizing they are in pursuit of the same people, the duo joins forces. Wikipedia