Frank Foster (Detective Inspector Davidson), Freda Bamford (Polly), Philip Leaver (Count Victor Mattoni), Frederick Bradshaw (Detective Sergeant Raines), Erik Chitty (Martin), Diarmuid Kelly (PC Clifton), Olga Edwardes (Louise Rogers), Mildred Shay (Renée la Lune), Val Norton (Samuel Diamond), Howard Douglas (Johnson), Arthur Goullet (Mullet), Guy Kingsley Poynter (Bernard K. Froy), and Bruce Belfrage (Viscount Sorrington).