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You can watch Twins of Evil (1971) for free on Fawesome.

While dabbling in Satanism, Count Karstein resurrects Mircalla Karnstein who initiates him into vampirism. As a rash of deaths afflicts the village, Gustav the head of Puritan group leads his men to seek out and destroy the pestilence. One of his twin nieces has become inflicted with the witchcraft but Gustav's zeal and venom has trapped the innocent Maria, threatening her with a tortuous execution, whilst Frieda remains free to continue her orgy of evil.

Can a village survive when a bloodthirsty vampire rises from a ritualistic mistake? This Hammer classic pits religious fanaticism against ancient, supernatural hunger in a race to stop a lethal contagion.

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