The Secret of the Black Widow (German: Das Geheimnis der schwarzen Witwe) is a 1963 West German crime film directed by Franz Josef Gottlieb and starring O. W. Fischer, Karin Dor and Klaus Kinski.

[1][2] It is part of a boom of Krimi films produced during the decade, the third of four films based on the work of Louis Weinert-Wilton that came in the wake of Rialto Film's successful Edgar Wallace adaptations.

The film's sets were designed by the art director Ramiro Gómez.

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