The Dark Mirror (1946) (b/w)

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A man is stabbed to death, and all the signs are that his lover Terry Collins (Olivia de Havilland, Gone with the Wind) is the culprit. But it s impossible for Lieutenant Stevenson (Thomas Mitchell, Stagecoach) to prove this, as Terry has an identical twin sister, Ruth, and there s no way of demonstrating which one has the cast-iron alibi.