A a lawman assigned to investigate a series of gold shipment robberies is twice falsely accused of murder. Arriving in the middle of a hold-up, Randall finds himself accused of killing the driver. Wells Fargo agent Cal Chambers vouches for his innocence, however, claiming him to be a noted geologist. Along with several of the prospectors, Jim devises a plan to prove that Jud Parker is using his dummy mine as a cover for stealing ore.