Lucienne Delamare and Pierre Maury are having an affair. Lucienne’s husband Paul is the mayor, and a French deputy. Pierre’s wife Clotilde has been weak and sickly for years. Lucienne’s husband holds no excitement for her, and he is always away in Paris on business. Pierre is now the vice-mayor, thanks to Paul. Lucienne and Pierre have a secret meeting spot by a lake along a co…