Divers Brad and Tony arrive in Jamaica to attempt salvage of the 'Lady Luck,' sunk with all hands and a million in gold. They charter a boat, 'American Beauty,' skippered by attractive Terry McBride, but cannot find the ship. But there's more to the 'Lady Luck' than meets the eye, and undersea skullduggery forms a counterpoint to Brad's romance with Terry, and Tony's with cabaret singer Venita.—Rod Crawford