 On the night of their tenth anniversary, Doctor Rene Richard (Jean Gabin) accidently discovers that his wife, actress Madeleine Richard (Michele Morgan), has been having an affair with a disturbed artist, Daniel Prevost (Walter Chiari)who has just attemped suicide. He confronts her and she spends the night trying to explain the reasons for her infedelity...he took their marriage for granted, he spent too much time at work, he appeared to be attracted to his pretty assistant and yada, yada, yada...in two languages and some badly-dubbed English. Will he buy this? Will they stay together?