Ma cousine de Varsovie

Archibald Burel, a banker, has had enough of his wife cheating on him, and with his best friend Hubert into the bargain. One day he has (at least that is what he thinks!) a bright idea : he asks Sonia, his cousin traveling in France but staying in Saumur at the moment, to seduce Hubert. In these conditions, how could Lucienne not fall into his arms again?