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Teresa Burns embarks on a research expedition in the South American jungle, where a mysterious creature's bite alters her life forever. Upon her return, she exhibits heightened aggression and senses, along with an uncontrollable fervor. The bite awakens a primal lust and a deadly urge within her. As a series of gruesome murders unfold, her boyfriend Paul becomes the prime suspect, desperately revealing Teresa's alarming transformations to the authorities. As her insatiable passion intensifies, so does her thirst for blood, leading her deeper into madness and threatening to unleash the demons lurking inside her.