Lorenzon is a Spanish tyrant who attacks and butchers the people of a Caribbean island after they refuse to pay him tribute. Megowan and Longo manage to escape from their island home. They become pirates, commanding a ship called the "Black Witch." They return to avenge the wrongdoings,
but Megowan is hurt and Longo is taken prisoner. Danieli, the governor's daughter, finds Megowan and nurses him back to health. Meanwhile Longo decides to join up with the enemy and is in turn joined by Pampanini--a woman who wants revenge on Megowan for ignoring her advances--but she is killed,
along with the traitorous Longo and Lorenzon when they try to stop the pirates. Megowan ...