Arizona rancher Rance Cartwright, who is dying, dictates his will to lawyer Sam Creech. The will leaves most of Cartwright's ranch to Edna Mae, his dead son's daughter, whose whereabouts are unknown. Creech is about to begin his search for Edna Mae when he is visited by Peter Slawson, known as "The Tonto Kid," whom he recently defended on murder charges. The Kid informs Creech that he has discovered platinum in Devil's Pocket, a ravine on Cartwright's land. Because the ore is on private property, it cannot be staked as a mining claim, so the Kid suggests that Creech look for a way to gain control of the area. Creech then locates the circus where Edna Mae was last employed. When he is told that the destitute Edna Mae has killed herself, Creech convinces her equally impoverished friend, Nancy Cahill, to impersonate the girl and split the inheritance with him. Nancy and Creech arrive at the ranch just as Cartwright dies, and her assumed identity is accepted. Creech is not satisfied with his share of the inheritance, however, and plots to acquire the Devil's Pocket for himself. Creech frames the Kid for the murder of Harry Peck, and the sheriff arrests him, but the Kid escapes and hides out with Nancy at the ranch. When Nancy receives a note from Edna Mae, who is still alive, she shows it to Creech and refuses to continue her deception. Creech then forces Wesley Fritch, another of his clients, to kidnap Edna Mae on the road. Creech's plans backfire when Fritch becomes convinced that Edna Mae is the real heiress and defends her from the lawyer. The Kid arrives just in time to help Wes overcome Creech, who is revealed to be Peck's murderer. The mine is then divided between Edna Mae and Nancy, which enables Nancy and the Kid to be married.