
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.

as Dr. Manetta

as June Lansdowne

as Ann Cody

as Glenda Baker

as Edward Havelock

as Dick Martin

as Inspector Cornelius 'Andy' Sneed

as Luis Silva

as Lord Charles Francis Selford

as Bevan Cody

as Tom Cawler

as Chief Commissioner

as John Selford

as P.C. in Sneed's Office (Uncredited)

as Handwriting Expert (Uncredited)

as Chief Commissioner (Uncredited)