 Dan Crackett, Secret Service Agent, is looking for a counterfeit money ring. He has tracked the stolen plates to somewhere in Mexico. In Washington, Saxby sends Brass Bancroft to El Paso to team up with Dan. They make plans to meet in a gambling saloon in Mexico called the  Silver Slipper . It is there that the gang kills Dan and pins the murder on Brass. Brass, with the help of Gabby and Elaine, must stay out of jail so that he can find where the press is working and who is behind the counterfeit bills.