 |
Crauford Kent as Inspector Angus Blake |
 |
Florence Allen as Lady Diana Blanton |
 |
Albert Prisco as Prince Darius (as Albert Priscoe) |
 |
Monte Montague as Jarvis |
 |
Grace Cunard as Mary Duveen- aka Queen of Diamonds |
 |
Herbert Prior as Lord Blanton |
| Writing | Harold M. Atkinson | Scenario Writer |
| Writing | Harold M. Atkinson | Story |
| Directing | Ray Taylor | Director |
| Production | Henry MacRae | Producer |
| Editing | Alvin Todd | Editor |
| Camera | John Hickson | Director of Photography |
