Sixties couples Michael and Donna and Paul and Erica become involved with the intense Count Yorga at a Los Angeles séance, the Count having latterly been involved with Erica's just-dead mother. After taking the Count home, Paul and Erica are waylayed, and next day a listless Erica is diagnosed by their doctor as having lost a lot of blood. When she is later found feasting on the family cat the doctor becomes convinced vampirism is at work, and that its focus is Count Yorga and his large isolated house.
Larry Coe (Kirk Douglas) é um arquiteto bem sucedido que deixa de amar Eve Coe (Barbara Rush), sua esposa. Um dia cele onhece Maggie Gault (Kim Novak), sua vizinha, que tem um marido que perdeu o interesse sexual por ela. Neste contexto eles começam a ter um affair, mas logo estão se amando intensamente.