Rodeo stunt rider Richard Barthelmess (as Joe "Chief" Thunder-Horse) thrills crowds at the Chicago "World's Fair" celebrating a century of progress in Native American Indian affairs. An assimilated Sioux, Mr. Barthelmess receives word that back on the Reservation his father is dying. Barthelmess takes time out to fulfill a sexual fantasy with shapely blonde Claire Dodd (as Norma), then drives to the Reservation with his happy-go-lucky manservant. On the way, he is attracted to red-skinned Ann Dvorak (as Lydia). Barthelmess discovers his forgotten brethren are being mistreated, and need help...