Unable to cope with a series of raids on stagecoaches hauling gold to the U. S. Mint, Sheriff Masters appeals to the U. S. Marshal's office for help. The Marshal assigns his best man, Johnny, to the job of discovering the hiding place of the stolen gold and bringing the outlaws to justice. Johnny enlists the aid of Bess Benson and her brother Bob. Bess insists on taking her pack dog, Daisy. The foursome then goes to the territory controlled by Sheriff Masters.