A beautiful girl Rosina lives In Rome. Her husband is strong as a bull and jealous as Shakespeare's Othello. Once the husband of Rosina kills a wealthy aristocrat, who sang the serenade to his wife, and now he is hiding from justice.
In 1867, with Garibaldi's forces close to bringing Rome into the Italian kingdom, Monsignor Colombo da Priverno, a world-weary judge on the papal court, wants to resign, disgusted by the violence to which the papacy resorts to hold secular power.