La guinguette à deux sous - Georges Simenon
Following up an obscure lead left to him by a criminal about to be executed, Maigret discovers a hidden side to a group of Parisians of respectable professions, and becomes a witness to what they get up to in their leisure time. At the weekends, these respectable gentlemen - engineers, businessmen, shop owners, doctors - and their wives, all make their way to a tavern on an outlying location on the Seine known as the Guinguette à deux sous, where they indulge in dressing up, role-playing, heavy drinking, fine eating, and a little bit of fishing and canoeing. Extramarital affairs are also indulged during the partying, often with the tacit consent of all the couples involved. Such matters are not of great concern to Maigret and not why he is at the Guinguette à deux sous when he should be on holiday in the country with his wife. He's been told by the criminal to be executed, Lenoir, that there is a murderer among the group who was seen six years ago dropping a body into the canal Sai...