A wealthy lord dies and is entombed with a valuable deposit of jewels. Seven keys are required to unlock the tomb and get hold of the treasure. A mad doctor uses an iron maiden to systematically eliminate the heirs to the fortune.
Dr. Manetta
Leslie Banks
June Lansdowne
Lilli Palmer
Ann Cody
Cathleen Nesbitt
Glenda Baker
Gina Malo
Edward Havelock
David Horne
Dick Martin
Romilly Lunge
Inspector Cornelius 'Andy' Sneed
Richard Bird
Luis Silva
J.H. Roberts
Lord Charles Francis Selford
Aubrey Mallalieu
Bevan Cody
Harry Hutchinson
Tom Cawler
Phil Ray
Chief Commissioner
George Street
John Selford
Ross Landon
P.C. in Sneed's Office (Uncredited)
Raymond Mander
Handwriting Expert (Uncredited)
Charles Paton
Chief Commissioner (Uncredited)
George Street