He works at night behind locked doors. Slowly, carefully, he engraves the serial number on the ten-dollar bill he is counterfeiting. He is very skillful. But no matter how good a job this criminal does, he will be caught and sent to prison. For the men of the Secret Service are on his trail! Here are the thrilling stories taken from the files of the U.S. Secret Service. Here is the true story of this remarkable agency—how it began and the courageous work it does.