Occupants of a London boarding house become suspects as a string of murders are discovered.
| Actor | Role |
|---|---|
 Frieda InescortMrs. Stella Rosabelle Armitage | Mrs. Stella Rosabelle Armitage |
 Paul CavanaghJoseph 'Joe' Reynolds | Joseph 'Joe' Reynolds |
 Heather AngelSylvia Armitage | Sylvia Armitage |
 Bruce LesterHugh Bromilow | Hugh Bromilow |
 Miles ManderTom Armitage | Tom Armitage |
 Lumsden HareInspector | Inspector |
 Turhan BeyRam Singh | Ram Singh |
| CCharles IrwinConstable | Constable |
 Phyllis BarryLucy Timson | Lucy Timson |
| MMary FieldPhoebe Marcia St. John Snell | Phoebe Marcia St. John Snell |
| PPaul RenayHindu Sailor | Hindu Sailor |
| MManuel LópezHindu Sailor (Uncredited) | Hindu Sailor (Uncredited) |
 Paul PanzerTaxi Driver Helping Ram Singh (Uncredited) | Taxi Driver Helping Ram Singh (Uncredited) |