 The Frontier Marshals have been called in to try and break up a counterfeiting operation. Phony bills received at their horse auction leads them to Duke Mallory s dude ranch. Mallory holds an engraver prisoner and gets rid of the fake bills by having three of his cronies become big winners at his gambling tables. Lee Powell tries to become Mallory s partner to get evidence but is made a prisoner when his true identity becomes known.