Martin is secretly in love with the beautiful Eleonora Lambriani, a mysterious dancer with a legendary reputation. However, he has already sworn his love to Sophie. When Martin prepares to leave in order to offer his life and his money to Eleonora, his cousin Cassian arrives at his house. Initially inconsolable because of the departure of her lover, Sophie changes from the virtuous girl to the woman expressing her desire for Cassian, then she elopes with him by jumping out of the window. Martin dies by the hand of Cassian, poor as a church mouse, as he has lost all his money in a dice game against Cassian.