Bat is asked to find how stolen Mexican cattle, many diseased, are entering Texas and mingling with local animals. With the help of the local sheriff he prints a wanted poster which he hopes serve as his introduction to the local rustlers.

When a man Bat staked to search for the Lost Dutchman's Mine disappears, Bat buys a map from a too agreeable bartender and sets off in pursuit. Bat soon learns that his friend is but one of many miners who have recently vanished.