Capt. Johnnie Gray is enlisted by Mr. J.G. Reeder to infiltrate a gang of forgers in Dartmoor jail on behalf of the Bank of England.
| Actor | Role |
|---|---|
 Peter Murray-HillCapt. Johnnie Gray | Capt. Johnnie Gray |
 Sally GrayClaire Kent | Claire Kent |
 Gibb McLaughlinMr. J.G. Reeder | Mr. J.G. Reeder |
 Malcolm KeenPeter Kent | Peter Kent |
 Leslie PerrinsJeffrey Legge (Maj. Jeffrey Floyd) | Jeffrey Legge (Maj. Jeffrey Floyd) |
 Sarah SeegarLila Legge | Lila Legge |
| DD.J. WilliamsEmmanuel Legge | Emmanuel Legge |
| RRex CarvelSir John Flaherty | Sir John Flaherty |
| RRobert CochranDet. Insp. Barker | Det. Insp. Barker |
 Philip RayFenner | Fenner |
 Bobbie ComberGray's butler | Gray's butler |
| FFlorence GrovesDaisy, club desk-clerk | Daisy, club desk-clerk |
 George MerrittBert Stevens, club porter | Bert Stevens, club porter |