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.

• Universal Pictures
• Boris Karloff
• Bela Lugosi
• Frank Lawton
• Frances Drake
• Violet Kemble Cooper
• Beulah Bondi
• Walter Kingsford
• Paul Weigel