In the South Seas, Seaman Duke (John Wayne) boards a whaler, and asks the owner, Capt. Drew (Montague Love) and his daughter Janet (Diana Gibson) to look after the pearls he's gathered. Drew, who's dying, persuades Duke to marry Janet to prevent her from marrying crewman Rand (Moroni Olsen), who's thereafter suspicious of Duke. When the crew learns Duke knows where more pearls are, they want to go after them, but Duke sides with Janet, who's after whales, though he's still opposed by Rand. Eventually, incited by Blackie (Maurice Black), the crew mutinies, forcing Rand and Duke to work together. ~ Bill Warren, Rovi