 | Detective Inspector Gregory |
 | Leopold Dryden |
 | Rodney Fleming |
 | Guy Bannister |
 | Poppy Levine |
 | Herbert Evans |
 | Sydney Parsons |
 | Sir Herbert Farquharson |
 | Peter Ridgwell (as Bruce Lister) |
 | Commissioner of Police |
 | Herself |
 | Joseph Higgins |
 | Weisskopf |
 | Man On BBC Reception Desk |
 | Detective |