Matthias Duval is in love, but he can't choose between the two twin sisters Betty and Liz Kerner. To pick up the two sisters, he invents his own twin brother and will play both characters.

A young peasant named Pierre makes friends with John and his sister Sonia, young bourgeoisie, who invite him to their home. Pierre soon falls in love with Emily, John's mistress. After the death of the father of his hosts, he has the idea of ​​transforming their peaceful house into a brothel.