There's twice the horror from Boris Karloff in this shocker that features him as twin brothers─one good and one evil─living in a tiny European nation. After becoming a hated tyrant who rules over his people with an iron fist, the nasty bro begins to sense that a revolution is imminent. But when he retrieves his nice sibling from exile with hopes of switching places with him, he sets his sinister plans in motion. With Marian Marsh, Thurston Hall, John Buckler. Mille. AKA: "The Black Room Mystery." Standard; Soundtrack: English Dolby Digital mono.