John Wyatt is a government agent sent to smash a counterfeiting operation near the Mexican border. Joining Doc Carter's medicine show they arrive in the town where Curly Joe, who once framed Carter, resides.
The Marshal sends John Weston to a rodeo to see if he can find out who is killing the rodeo riders who are about to win the prize money. Barton has organized the rodeo and plans to leave with all the prize money put up by the townspeople. When it appears that Weston will beat Barton's rider, he has his men prepare the same fate for him that befell the other riders.
In 1889 pioneers race ahead of the law to claim free land in Oklahoma, forming wide-open towns. In one such, citizens elect Milt Dawson to challenge the self-appointed rule of gambler Ace Holmes, only to have him shot in the back. But leading the next batch of settlers is Milt's quick-on-the-draw son John, who gets help from friendly outlaws.
