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
June Lansdowne
Ann Cody
Glenda Baker
Edward Havelock
Dick Martin
Inspector Cornelius 'Andy' Sneed
Luis Silva
Lord Charles Francis Selford
Bevan Cody
Tom Cawler
Chief Commissioner
John Selford
P.C. in Sneed's Office (Uncredited)
Handwriting Expert (Uncredited)
Chief Commissioner (Uncredited)
