The plot follows Raymonde, the wife of Victor who has begun to suspect her husband of cheating on her. The clues are there for her to see, but she is unaware that he has perfectly valid excuses for all of them. However, keen to learn the truth, she decides to set up a trap alongside her friend Lucienne to lure him into meeting with another woman. The plan backfires when Victor sends another in his place, with more and more people added to the mix until a mass of embarrassed faces are left scratching their heads.