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When Jacques Decret (Gérard Oury) discovers that his wife Gloria (Jeanne Moreau) has been unfaithful, he devises an all-too-clever scheme of revenge in Edouard Molinaro's Le Dos au Mur (Back to the Wall): he sends her an anonymous blackmail letter. After she ignores the threat, he cranks up the pressure and sends incriminating photographs. While Gloria does send him the money, she and her lover Yves (Philippe Nicaud) try to fight back. But Jacques outsmarts them by turning the lovers against each other. Not surprisingly, the plan spirals out of control, and the results are even more sordid than Jacques had intended.