In 1883, an American merchant ship's captain is searching for a treasure in diamonds from a sunken Dutch ship
Tough South Seas skipper Fred MacMurray goes hunting for pearls on a forbidden Javanese island. Native girl Vera Ralston falls in love with MacMurray and defies local laws to help him. She is punished by the island rulers, compelling MacMurray to spirit both Vera and the pearls off the island. As they make a last desperate attempt to escape, a lava-spewing volcano threatens to destroy the island.