Rich industrialist Jacques Decret learns his wife Gloria is having an affair with a young actor. For revenge, he bombards her with anonymous letters, convincing her that her lover is the culprit while Gloria desperately seeks a way out.

Jeanne Moreau
as Gloria Decrey

Gérard Oury
as Jacques Decrey

Philippe Nicaud
as Yves Normand

Claire Maurier
as Ghislaine

Gérard Buhr
as Mario

George Cusin
as Police commissioner

Robert Bazil
as Police inspector

Jean Degrave
as Le bijoutier

Richard Francœur
as Jeweler

Françoise Honorat
as Guest of the Decreys