A murderous gang of counterfeiters has kidnapped the government's best engraver and is forcing him to print virtually undetectable phony money. The Secret Service's toughest agent, Jack Holt, and a female reporter go after the gang.
| Actor | Role |
|---|---|
 Jack HoltJack Holt / Nick Farrell | Jack Holt / Nick Farrell |
 Evelyn BrentKay Drew | Kay Drew |
 John Ward'Lucky' Arnold | 'Lucky' Arnold |
 Ted AdamsQuist | Quist |
 Joe McGuinn'Crimp' Evans [Chs. 1, 4-15] | 'Crimp' Evans [Chs. 1, 4-15] |
 Tristram CoffinEd Valdin [Chs. 1-10] | Ed Valdin [Chs. 1-10] |
 Stanley BlystoneGarrity [Chs. 11-15] | Garrity [Chs. 11-15] |
 George ChesebroRankin [Chs. 11-15] | Rankin [Chs. 11-15] |
 Stanley PriceDent [Chs. 11-15] | Dent [Chs. 11-15] |
 C. Montague ShawChief John W. Malloy (as Montague Shaw) | Chief John W. Malloy (as Montague Shaw) |
 Edward HearnAgent Jim Layton | Agent Jim Layton |
 Jack CheathamAgent Frank [Chs. 3-5, 8-9, 15] | Agent Frank [Chs. 3-5, 8-9, 15] |
| RRay ParsonsJohn Severn - Engraver [Chs. 1-4] | John Severn - Engraver [Chs. 1-4] |