The arrival of the shipwrecked captain, Cleveland, spoils young Mordaunt's relationship with the Troil girls, and soon a bitter rivalry grows between the two men. Minna falls in love with Cleveland, not knowing his true profession. Brenda however is in love with Mordaunt. The pirates capture the Troils, but after an encounter with the frigate HMS Halcyon, they are freed. Brenda and Mordaunt are reunited, and Minna and Clement parted.