With Britain on the brink of war, an enemy spy plans to steal secret documents and lay the blame on Clive Stanton.
| Actor | Role |
|---|---|
 Geoffrey TooneCmdr. Clive Stanton | Cmdr. Clive Stanton |
 Judy KellyCynthia Maybridge | Cynthia Maybridge |
 Kenneth KentCol. Suvaroff | Col. Suvaroff |
 Clifford EvansLt. Peel | Lt. Peel |
| JJohn WoodSub. Lt. Wing Eden | Sub. Lt. Wing Eden |
| DDaphne RaglanDora Maybridge | Dora Maybridge |
 Edmund BreonAdm. Maybridge | Adm. Maybridge |
 Doris HareMrs. Maybridge | Mrs. Maybridge |
| MMarguerite AllanAnna Suvaroff | Anna Suvaroff |
 Leslie PerrinsBriggs | Briggs |
 Olga LindoMrs. Rance | Mrs. Rance |
| FFrank FoxFrançois | François |
| AAlf GoddardTomkins | Tomkins |
 Albert BurdonNoakes | Noakes |
 Diana BeaumontMillie | Millie |
 Fred EmneyCook | Cook |
| LLaurence KitchinNot listed | Not listed |
 Henry OscarCmdr. Perrin | Cmdr. Perrin |
 Carla LehmannNot listed | Not listed |
 Michael RipperNot listed | Not listed |
 Nigel StockNot listed | Not listed |
| GGeorge SpenceHenchman (uncredited) | Henchman (uncredited) |