Holt of the Secret Service (1941) was the 16th serial released by Columbia Pictures.
Plot:
A murderous gang of counterfeiters has kidnapped John Severn, the U.S. government's best engraver, who is being held against his will and is forced to print virtually undetectable phony cash. The United States Secret Service sends its toughest agent, Jack Holt, and his female partner, Kay Drew, after the gang. Holt and his boss Malloy decide to try to pass Holt off as escaped tough guy, Nick Farrel. Masquerading as the bickering Mr. and Mrs. Farrel, Holt and Drew manage to infiltrate the. . .