Morgan Adams (Geena Davis) is the daughter of pirate captain Black Harry. On his death bed, Black Harry bequeaths his ship and his crew of bandits to her, also revealing that he has one third of a treasure map tattooed on his skull. Morgan sets sail on the high seas in Jamaica with her well educated slave, William Shaw (Matthew Modine) in search of the two remaining pieces of the map which lie in the hands of Morgan's evil uncle, Captain Dawg (Frank Langella)...