Cannonball McKay has taken on Clem Jones as an assistant stage driver. Clem is recently out of prison and no one can figure out why Cannonball is helping Clem. Doc Tate gives Clem $10 to deliver a letter to the next town. Meanwhile, Doc Tate and his henchmen rob the Well Fargo office and manage to pin it on Clem. A posse catches up with Clem and takes him back to jail. Doc Tate is going to blow up the jail to rid of Clem but the Sheriff and the Lone Ranger con Doc into staying at the jail until after the jail was going to explode. Doc Tate, fearing for his life, tells all. At the end we find out why Cannonball is helping Clem.