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