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...