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Cette Nuit La (That Night) was based on a novel by Michel Lebrun. Mylene Demongeot plays Sylvie, the gorgeous photo-model wife of magazine layout artist Jean (Maurice Ronet). Sylvie becomes the object of desire for Jean's boss (Jean Servais), an older man of degenerate tastes. Angered by this turn of events, Jean plots to murder his employer. Unfortunately, the assault takes place at night, and Jean accidentally kills the wrong man. Several unpleasant complications ensue -- including a rather nasty extortion scheme -- before the exciting (if predictable) denouement.