An eastern gambler playing a "system" breaks the bank at Bat's casino, putting the dapper Masterson out of business. Bat wonders if the "system" didn't have more than a little help from his pretty dealer.

The stagecoach in which Bat Masterson, Major Mars and pretty Lottie Tremaine are traveling is waylaid by a vengeful gang led by an Indian whose family was slain when the Major's men wiped out a village. Bat is forced to defend the Major.