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In this 16th-century swashbuckler, the trouble begins when a sea captain is unjustly sentenced to hang by the evil ruler of the Duchy of Doruzzo and his daughter. Meanwhile, the comely lass who believes herself the doomed captain's daughter is about to be sold to a harem when they are freed by a handsome hero whom the captain hopes will marry his daughter. Father and daughter then become pirates, and the hero is obligated to catch them, but when he falls in love with the girl, he switches allegiance and helps her attack the ruler's palace. The two then lead the other pirates, and the angry peasants in a revolt, resulting in the eventual death of the ruler, who confesses on his deathbed that the female pirate (the captain's supposed daughter) is his real daughter and heir to the Duchy; he then goes on to tell her that years before he had ordered the captain to kill her, but he refused and raised her instead. This confession so angers the other daughter that she goes into a convent; meanwhile the pirate lovers prepare for their wedding.