Englishman Sir Ronald Burton enters the castle of Austrian nobleman Count von Bruno, complete with torture chamber and moat, while investigating the disappearance of two friends.
| Actor | Role |
|---|---|
 Richard GreeneSir Ronald Burton / Richard Beckett | Sir Ronald Burton / Richard Beckett |
 Boris KarloffDr. Meissen | Dr. Meissen |
 Stephen McNallyCount Karl von Bruno | Count Karl von Bruno |
 Rita CordayCountess Elga von Bruno | Countess Elga von Bruno |
 Lon Chaney Jr.Gargon | Gargon |
 John HoytCount Steiken | Count Steiken |
 Michael PateCount Ernst von Melcher | Count Ernst von Melcher |
 Nancy ValentineTherese von Wilk | Therese von Wilk |
 Tudor OwenRomley | Romley |
 Henry CordenFender | Fender |
 Otto WaldisInnkeeper Krantz | Innkeeper Krantz |
| RRoy EngelBurgher | Burgher |
| LLeslie DenisonSir David Layton (uncredited) | Sir David Layton (uncredited) |
| BBernard SzoldKoppich (uncredited) | Koppich (uncredited) |
 Jack PerrinHunter (uncredited) | Hunter (uncredited) |
| FForrest BurnsGuard (uncredited) | Guard (uncredited) |
 Chuck HamiltonGuard (uncredited) | Guard (uncredited) |
| JJohn RoyGuard (uncredited) | Guard (uncredited) |
| VVictor RomitoGuard (uncredited) | Guard (uncredited) |