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Detective Miss Marple (Helen Hayes) is on vacation, luxuriating in an opulent Caribbean resort. She meets quirky mystery writer Maj. Geoffrey Palgrave (Maurice Evans), who giddily informs her that he believes one of the other guests is a wife-murdering serial killer. But before he can reveal the alleged killer's identity, Maj. Palgrave dies under suspicious circumstances. Soon there are other victims. Now, Miss Marple must take on the case before more are murdered. Wikipedia