Assigned by the Union Army to investigate the Indian commissioner's death, a Native American known as Captain Apache (Lee Van Cleef) uncovers a sinister assassination plot in this vintage Spanish-made Western. Anyone who might have information on the man's death is killed before they can divulge their secrets, forcing Captain Apache into an alliance with an untrustworthy land owner. Carroll Baker, Stuart Whitman and Elisa Montes co-star.