Wealthy Charles (Michel Bouquet) begins to suspect his wife, Helene (Stéphane Audran), is having an affair and hires private detective Bignon (Serge Bento) to follow her. Bignon reports that Helene sees Victor Pegala (Maurice Ronet), a divorced writer, three times a week. Unsure what to do, Charles avoids confronting his wife directly. Instead, armed with Victor's address and trying to remain even-tempered, he skips out during his son's birthday party to pay a visit to Helene's lover.
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