A US marshal and his Native American sidekick are on the trail of the Shadow, a mysterious criminal mastermind behind a gang of outlaws. When a town sheriff is killed, the lawman takes over his duties, which leads him to uncover the Shadow's hideout and prepare a trap. Western, starring John Wayne, Yakima Canutt and Verna Hillie.

John Travers and Yak, his faithful Indian sidekick, pick up where a murdered sheriff leaves off, and try to nab the mysterious Shadow.