John Wyatt is a government agent sent to smash a counterfeiting operation near the Mexican border. Joining Doc Carter's medicine show they arrive in the town where Curly Joe, who once framed Carter, resides.
This is really just a rehash of half a dozen other plots written by Robert Tansey, and not even the charisma of the Duke can rescue it from mediocrity. Here he is "Wyatt" leading an US government investigation into a counterfeiting ring on the US border with Mexico. He teams up with "Doc. Carter" (Earle Hidgins) and his daughter "the Princess" who run a medicine show - not sure if they may or may not be involved. There are plenty of frame-ups, doubles crosses and even some Federales as Wayne soon gets on the trail of Yakima Canutt ("Curly Joe") so now we know to expect some fun rough and tumble. It's fine, this - just nothing at all to mark it out as in any way special.