Bronco is working undercover with the Army to seek out the identity of a former Confederate guerrilla who is still at large and find out what has happened to a large cache of stolen Union gold. He is chasing a man, Colton, suspected as a member of the gang when he is shot. Bronco stops to help him but Colton knocks him out. Bronco traces him back to Dodge City where he dies as he exits a saloon with no money. On the stage to an Army post he meets a beautiful nun who is going to New Orleans. At the Army Post he reports to Colonel Welch and Major Creighton. They decide he should go to the guerrilla's hometown of Bonnetville to look for the guerrilla and the gold bullion which is slowly being converted to cash. There he spots the nun in a saloon dealing cards. He becomes involved with her as she could be an escaped Confederate spy who helped steal the money. Bronco wins her trust and uses it to infiltrate their ring and get close to the truth.