Wealthy industrialist Jacques Decret (Gérard Oury) learns that his wife Gloria (Jeanne Moreau) is having an affair with a young actor (Philippe Nicaud). To get back at her, he starts sending her anonymous letters to make her think it's her lover who's blackmailing her... “'LE DOS AU MUR is a superb piece of domestic noir that should be far more widely known than it is,” writes John Grant for Noirish, and I wholeheartedly agree with this statement. Jeanne Moreau and all the other actors prove to be an exquisite ensemble. Above all, however, the story itself, even though it progresses at a leisurely pace, delivers a number of surprises at various turning points. Particularly successful is the twist in the finale, which in comparable films often seems forced or even implausible, but here precisely marks the final and definitive step in the drama." (Matthias Merkelbach, on: der-film-noir.de)