Cheyenne Harry (Carey) and his pals, bent on helping their friend Rawhide Jack, attend a rodeo with the intent to win the prize for roping steers and to hand the winnings over to Jack.

Inventor Harry Harper travels to the South Seas, where there is buried treasure belonging to a girl, Beverly West. Naturally, others are after the loot, and Beverly's father is being held captive by cannibals until she returns to them with a pearl that belongs to one of their idols. The climax consists of Harper saving Beverly from a safe which has been lowered into the sea.