Bat and his partners fleece an unscrupulous businessman out of half the profits in a gold mine. He exacts revenge by buying up the timber they need to shore up the mine walls, then tries to kill the men with an explosion in the mine.

Bat's friend, Ellie Winters, is hired by promoters selling shares in their diamond mine. Although Ellie is convinced that the mine is legitimate, Bat investigates and discovers the owners are salting the mine with high-grade quartz.