This sprawling epic adventure pits the tough-minded Captain Ralls (John Wayne) against the treacherous Captain Sidneye in a bitter rivalry on a South Seas isle. At stake is a fortune in pearls hidden in an underwater cave. At risk is the hand of the beautiful Angelique, daughter of Desaix, the tyrant ruler of the island who plans to marry her off to Sidneye. In an attempt to rescue Angelique, Ralls must seize the pearls and exchange them for her freedom. The danger continues as fate holds one final test of strength and bravery for the bold Captain and the woman he loves.