| Lord Pastern and Bagott | |
| Lady Pastern and Bagott | |
| Félicité de Suze | Her daughter |
| The Hon Edward Manx | Lord Pastern’s second cousin |
| Carlisle Wayne | Lord Pastern’s niece |
| Miss Henderson | Companion-Secretary to Lady Pastern |
| SpenceMiss ParkerWilliamMaryMyrtleHortense | | | Domestic staff at Duke’s Gate |
| Breezy Bellairs | |
| Happy HartSydney SkeltonCarlos Rivera | Pianist Tympanist Piano accordionist | | of Breezy Bellairs’ Boys |
| Caesar Bonn | Maître de café at The Metronome |
| David Hahn | His secretary |
| Nigel Bathgate | Of the Evening Chronicle |
| Dr Allington | |
| Mrs Roderick Alleyn | |
| Chief Detective-Inspector AlleynDetective-Inspector FoxDr CurtisDetective-Sergeant BaileyDetective-Sergeant ThompsonDetective-Sergeants Gibson, Marks, Scott and Sallis | Fingerprint expert Photographer | | Of the Criminal Investigation Department, New Scotland Yard |
| Sundry policemen, waiters, bandsmen, etc. | |
