The opera singer Maddalena had been cast out by her family after they learned she was to bear the child of a banker, von Keller, who had seduced and abandoned her. Her return to her native city has her father warn her to remain away, because she is a threat to her family, and her sister Marie's wedding. However, von Keller threatens the reputation of her family with an underhanded banking scheme. He commits suicide, and Maddalena is reconciled with her family.