Linda Westinghouse, an American lawyer working in Istanbul, begins having strange dreams about a mysterious, seductive woman. She is sent to an isolated island to settle the inheritance of a wealthy countess, only to encounter Countess Nadine Carody, the woman from her dreams. Nadine lives in a luxurious villa and shares eerie stories about her life and past. Linda is both mesmerized and disturbed by Nadine's allure as she entertains her with exotic performances involving trained animals and shadowy figures. The boundary between reality and fantasy blurs as Linda falls deeper under Nadine’s spell, experiencing a strong sense of déjà vu and uncanny attraction.

As Linda grapples with her intensifying feelings and fear, she meets Dr. Alwin Seward, who possesses knowledge of Nadine’s dark secret. Their investigation into the countess's enigmatic background leads to unsettling discoveries; they uncover a world of ancient rituals and supernatural influences. With her sanity unraveling, Linda must confront the powerful forces at play and find a way to break free from Nadine's captivating yet dangerous hold. The escalating tension between her own will and the supernatural draw leaves Linda in a state of perilous confusion, leading to confrontations that challenge her perceptions of reality and identity.