The US Secret Service searches for a gang of counterfeiters, whose brilliant
engraver Eugene Deane (
Morris Ankrum) has secretly made his plates while doing life in
San Quentin. A priest was tricked into serving as a
mule smuggling them out. A narrator explains the crucial role of
paper currency in underpinning trade in the economy, and how the US
Treasury Department ensures it is safeguarded by tracking down counterfeiters. When phony $10 bills start showing up at casinos and racetracks across the country the Treasury realizes that the bills are Deane's work. Surveillance is set up, which leads to a travelling salesman who has been distributing them across the country. However, before he can be captured and interrogated a ruthless gang member (
George Tobias) throws him out a window to his death. The Secret Service then puts undercover agent John Riggs (
Don DeFore) on the case. He poses as a thief interested in buying and selling counterfeit bills. Clues leads him to a Los Angeles hotel where the salesman lived. Riggs moves in, and is recruited by gang members. He also meets the beautiful hotel manager, Nora Craig (
Andrea King). While Riggs is romantically attracted to Craig, he also realizes that she may be connected to the gang. He learns she is not only the gang boss but Deane's daughter. Riggs' cover is blown and he is threatened with death. Federal agents and police descend on the gang's hideout, which catches fire. A pitched gun battle erupts amidst cable car rail trestles and bridges, with Craig plunging to her death. ==Cast==