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.
Leslie Banks
as Dr. Manetta
Lilli Palmer
as June Lansdowne
Cathleen Nesbitt
as Ann Cody
Gina Malo
as Glenda Baker
David Horne
as Edward Havelock
Romilly Lunge
as Dick Martin
Richard Bird
as Inspector Cornelius 'Andy' Sneed
J.H. Roberts
as Luis Silva
Aubrey Mallalieu
as Lord Charles Francis Selford
Harry Hutchinson
as Bevan Cody
Phil Ray
as Tom Cawler
George Street
as Chief Commissioner
