In the shadowy depths of Via Transilvanica, a group of adventurous teens stumble upon a centuries-old ghost named Katharina. Igniting curiosity, they bring her back to their world, endeavoring to integrate her into modern society. Initially charmed by the novelty, Katharina, once Vlad the Impaler's mistress, begins to reveal her darker nature. As the group struggles to understand their mistake, they must confront the horrifying consequences of their actions. Can they escape Katharina's vengeful wrath, or will their lives be forever entwined with the malevolent spirit?

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Some movies that have similar genres and were produced around the same time as Katharina include Late Night With the Devil, Baghead, The Sadness, Infested, Immaculate, Jije.