Fedora.

Fedora swears to avenge the death of her fiancé, Prince Yarischkine, killed by Ipanoff who fled to Paris. She finds Ipanoff whom she falls in love with and he confesses to having killed her fiancé because Yarischkine was his wife's lover. But learning that her brother was executed because of Fedora, Ipanoff leaves her. Fedora commits suicide.