Rex is a crusading veterinarian breaking up a gang smuggling counterfeit US currency from Canada. The phony money is hidden in cages shipped from villain Barcroft to Montana silver fox rancher Taylor. A sick fox leads Rex to slap a quarantine on the ranch, and after a number of gunfights
and fistfights, the whole operation collapses. By this time B-western writers were straining to come up with some fresh plot variations, but this one fails utterly.