David Cook and twin brother Tom are poles apart in disposition and traits. When their father dies, Tom goes to New Mexico to live with his Uncle Hardtack while David remains behind to care for their mother. The grown Tom becomes an outlaw while brother David becomes a government lawman. David is charged with apprehending Tom...

Escaped criminal "The Fox" hates Hoppy and a Rurales colonel for imprisoning him and lures Cassidy to Mexico in order to exact his vengeance.

It's 1860 and the old Spanish land grants are being surveyed. Montez is after part of Don Regas' rancho and gets the surveyor to alter the boundary. But Don Regas still has the original grant written on a bandanna. Montez sends Indians after it but Bill Cody and Gabby fight them off and a wounded Gabby unknowingly ends up with the missing million dollar deed wrapped around his arm for a bandage.