Driving off an Indian attack, the soldiers capture one of the Indian rifles only to learn that it came from their own warehouse. With Lieutenant Bentley and Sergeant Luke having the only keys to the guns, Bentley finds himself under suspicion and starts to investigate.
Two prisoners, Steve Brandt and Nick Montana, chained to each other, escape by jumping from the train that brought them to the penitentiary. Persued, they hide in the carriage with Jane Langton. Arriving at her ranch, they discover that she is fighting against a Pete Sutton, who wants to take her pasture. Not wanting to confront, Sutton offers the two escapees help by assisting them move to Mexico.
Lawyer Creech is after the ranch of the dying Cartwright. First he brings in Cahill to pose as the only living relative. Then when the Tonto Kid finds platinum on the ranch, Creech frames him for murder.
