This region of Arizona is lawless. Even when the criminal are captured, they are acquitted by the jury or the witness takes a sudden illness. Boone is a hard drinking, shoot up the town cowboy who is trying to get in with the Dutton gang. As yet, he is unsuccessful and his actions cause Lettie to break off their engagement. But Boone is undercover. He is the Captain of the Arizona Rangers - 14 men dedicated to the end of the outlaws. While he saves stages and stops bank robberies, he has not yet been found the secret leader of the gang.