Set in the late 16th century, this pirate tale follows a Cornish sea-faring gentleman, Sir Oliver Tressilian, as he is villainously betrayed by his jealous brother. Forced to serve as a slave on a Spanish galley, Sir Oliver is liberated by Barbary pirates, whom he joins under the name 'Sakr-el-Bahr', the hawk of the sea, and swears vengeance against his brother.