When a rash of murders depletes their number, a billionaire's employees are brought together at an Englishman's estate.
| Actor | Role |
|---|---|
 Ernest TorrenceDr. Ballou | Dr. Ballou |
 Roland YoungLord Montague | Lord Montague |
 Dorothy SebastianLady Efra | Lady Efra |
 Natalie MoorheadLady Vi | Lady Vi |
 Sydney JarvisThe Butler | The Butler |
 Polly MoranPolly, Maid | Polly, Maid |
 George CooperFrey, Lord Montague's Orderly | Frey, Lord Montague's Orderly |
 Sôjin KamiyamaThe Mystic | The Mystic |
 Claude FlemingSir James Rumsey | Sir James Rumsey |
 Clarence GeldartInspector Lewis | Inspector Lewis |
 John MiljanMajor Mallory | Major Mallory |
 Richard TuckerColonel Davidson | Colonel Davidson |
 John LoderCaptain Dorchester | Captain Dorchester |
 Philip StrangeLieutenant Williams | Lieutenant Williams |
 John RocheLieutenant Savor | Lieutenant Savor |
 Lionel BelmoreMajor Endicott | Major Endicott |
| GGerald BarryCaptain Bradley | Captain Bradley |
 Richard TraversMajor McDougal | Major McDougal |
 Ellinor VanderveerGuest at First Seance | Guest at First Seance |
 Boris KarloffAbdul Mohammed Bey - the Hindu Lawyer (uncredited) | Abdul Mohammed Bey - the Hindu Lawyer (uncredited) |