Léonard Planchon follows Maigret home to tell him his story. He'd come to the Quai des Orfèvres numerous times on Saturdays, earning himself the nickname "the Saturday caller" but had always left before seeing Maigret. He's planning to kill his wife and her lover, Roger Prou, one of his workers who has moved into his house. Maigret convinces him to call him daily, and worries when he doesn't call. His wife and Prou maintain that he left home one night and never came back, having sold his business to Prou, but Maigret discovers the money still in the house, and a week later Planchon's body is fished out of the Seine, and Prou and Planchon's wife are arrested for the murder.
This report prepared by Dana Samson