Dr. Janos Rukh discovers a certain type of radium that has almost magical healing properties. But the element has a dangerous side, too, and it has already started affecting Rukh. Consumed by paranoia, he begins to suspect that his wife is having an affair. Wild for revenge, Rukh hatches a deadly plot...using his own poisoned body as a weapon to kill.
Director
Lambert Hillyer
Boris Karloff
Dr. Janos Rukh
Bela Lugosi
Dr. Felix Benet
Frank Lawton
Ronald Drake
Frances Drake
Diana Rukh
Violet Kemble Cooper
Mother Rukh
Beulah Bondi
Lady Arabella Stevens
Walter Kingsford
Sir Francis Stevens
Paul Weigel
Monsieur Noyer
Frank Reicher
Professor Meiklejohn
Georges Renavent
Chief of the Surete
May Beatty
Mme. LeGrand (uncredited)
Paul McAllister
Papa LaCosta (uncredited)
Nydia Westman
Briggs (uncredited)
Ynez Seabury
Celeste (uncredited)
Robert Graves
Gendarme (uncredited)
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