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.
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Boris KarloffDr. Janos Rukh
Bela LugosiDr. Felix Benet
Frank LawtonRonald Drake
Frances DrakeDiana Rukh
Violet Kemble CooperMother Rukh
Beulah BondiLady Arabella Steven...
Walter KingsfordSir Francis Stevens
Paul WeigelMonsieur Noyer
Frank ReicherProfessor Meiklejohn
Georges RenaventChief of the Surete
May BeattyMme. LeGrand (uncred...
Paul McAllisterPapa LaCosta (uncred...
Nydia WestmanBriggs (uncredited)
Ynez SeaburyCeleste (uncredited)
Robert GravesGendarme (uncredited...
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