A Polynesian boy and his beloved pet shark provide the basis of this South Seas adventure. It all begins when the boy finds a helpless baby shark and, with the help of a girl friend, raises it as a pet. After the shark grows up, the boy reluctantly returns it to the ocean; he is sad for he fears he will never see it again. Ten years pass and the natives are being forced to leave their fisheries by modern, more organized fishermen. Leading the way to progress is the girl's brother who sends her to the US for an education. Meanwhile, the boy works as a pearl diver. One day his life is endangered and he is suddenly saved by his shark. He is thrilled until the modern fishermen destroy his village and force the residents to flee. Eventually the girl returns from the States; she, the boy, and the shark leave the island to find a peaceful home of their own.