Al Parker (Al Wilson), an aviator and Secret Service agent, is assigned to investigate a gang of bandits who have been robbing a platinum mine on the Mexican-American border. The superintendent of the mine, John Ames (Emmett King), is killed when he discovers a secret passage used by the bandits, and his daughter, Edith (Virginia Brown Faire), assumes the running of the mine. Edith is kidnapped by the gang's leader, McLeod (Lee Shumway), who makes his escape in a waiting airplane. Al, "The Air Hawk," gives chase, leaping between the planes in flight and beating McLeod in a desperate struggle. Al is then happily reunited Edith, with whom he has fallen in love.—Pamela Short