Bat down and out on his luck is hired as the bodyguard of a beautiful widow. She must wear a fabulously expensive diamond to the Governor's reception that evening but before they can leave the necklace is stolen while Bat is distracted.

Before Bat's partner in a casino venture is dies, he asks Masterson to deliver his share of the money to his brother on the Mexican border. Bat learns that the man is rumored to lead a gang of rustlers.