 Tom ConwayTom Conway, Private Investigator | Tom Conway, Private Investigator |
 Mila ParélyHelen Pascall | Helen Pascall |
 Naomi ChanceGina, a model | Gina, a model |
 Eric PohlmannMr. Mercedes | Mr. Mercedes |
 Andrew OsbornCapt. Colin Simpson | Capt. Colin Simpson |
 Richard WattisDetective Inspector MacLeod | Detective Inspector MacLeod |
 Margaret HalstanLady Marchant | Lady Marchant |
 Eileen WayMme. Fernande | Mme. Fernande |
 Michael RipperEddie | Eddie |
 Betty CooperMiss Betty, Showroom Mistress | Miss Betty, Showroom Mistress |
 Thomas HeathcoteDetective Sgt. Jessup | Detective Sgt. Jessup |
| AAlan RolfeInspector | Inspector |
 Roger DelgadoMarlowe | Marlowe |
| RReed De RouenHeath | Heath |
 Delphi LawrenceChelsea | Chelsea |
| CChristine ForrestBlonde | Blonde |
| AAnn HanslipJane, model with shoulder-length hair | Jane, model with shoulder-length hair |
| DDavy LeonGeorge | George |
| DDorothy RobsonA Seamstress | A Seamstress |
| LLeo PhillipsHarry, the Night Watchman | Harry, the Night Watchman |
| RRobert MooreStevenson | Stevenson |
| DDenis CowlesCommissionaire | Commissionaire |
| JJohn H. WatsonChauffeur | Chauffeur |
| CCleo RoseVivian | Vivian |
| CCab KayeSelf - Singer-Pianist (uncredited) | Self - Singer-Pianist (uncredited) |
| JJohn LynnNightclub Patron (uncredited) | Nightclub Patron (uncredited) |
| JJack MandevilleFashion Show Attendee (uncredited) | Fashion Show Attendee (uncredited) |
| EErnie PriestPoliceman (uncredited) | Policeman (uncredited) |
