Texas Ranger Lieutenant Luke Caldwell is leading a detachment of Rangers when they are ambushed by an outlaw gang. After a hard-fought battle, the Rangers defeat the gang, but at the price of several dead and wounded. Among the most severely hurt is Luke, who is sent home by the company surgeon to recuperate. Luke is nearly completely recovered when word comes that his sister's husband, Hank Brundage, the town marshal of Sonora and Luke's former riding...