John Wayne stars as a special agent who travels to Hawaii to tackle an international terrorist ring. A tough guy named Big Jim McClain. Agents Jim McLain (Academy Award winner Wayne) and Mal Baxter (James Arness) go undercover to flush out a cell of Communist terrorists, and McLain woos suspected sympathizer Nancy Vallon (Nancy Olson) to discover what secrets she may hold in a deadly game of cat-and-mouse set in a tropical paradise.
