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Watch The Perfect Neighbor online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

In Kansas City, the deranged middle-age Donna Germaine stabs and kills her lover, when he calls off their relationship to stay with his wife. Donna uses an excuse to move to the house of her aunt, and she becomes obsessed in their neighbor, the executive William Costigan. The sick Donna plots an evil scheme to take William from his wife Jeannie Costigan.