Published in Detective Comics #16, June, 1938, 8 pages.
"Valuable secret orders have been vanishing from the U.S. Intelligence Service's files. Upon Sally and Bart has fallen the task of ascertaining the culprit responsible." Certain the thief had to be working at the offices where the thefts occurred, Regan and Norris each take a job in the clerical section. (They wager a hamburger over who will nab the man first.) Catching him is only the first part, though, as they are then told to catch the one buying the intel from the thief.