Casanova, a young patriot in 18th-century Sicily, upon learning that his father and sister have been murdered, returns to Palermo and engages in guerilla tactics against the forces of the Governor. Lady Bianca, the Governor's daughter, is in love with one of the patriots, Lorenzo, and desires to escape from the palace. Her lady-in-waiting, Zanetta, enlists the aid of Casanova and he rescues them and takes them to the partisan's camp. The rebels are victorious. Lady Bianca makes plans to marry Lorenzo, and Casanova and Zanetta have similar plans.