Michel Simon is married to Germaine Reuver and they hate each other. He complains about her to everyone in town. One night, he hears Jean Debucourt on the radio. Debucourt is a lawyer who has won his hundredth acquittal and is interviewed on the subject. So Simon goes to the lawyer and confesses that he has killed his wife, draws out the details of how he has done it -- with an eye towards acquittal -- and goes home to kill her. When Debucourt shows up, Simon proceeds to blackmail the lawyer into mounting his defense in this excessively funny black comedy from Sacha Guitry.
If you want someone to play a monster and yet be very human and funny, you could never do any better than Michel Simon. Watching his ego grow, from that of a man frightened to go home to one lecturing judges in court, he makes everyone his straight man, thanks to Guitry's script (obviously written for his star's talents).
Guitry offers his credits in an unusual manner: he strolls around the set, complimenting his major collaborators, who appear as themselves -- although a couple who are heard only over the radio are thanked over the phone. It's a thoroughly theatrical invention from an artist who straddled stage and screen.