A young couple, George and Kathy Lutz, along with their three children, excitedly purchases a beautiful new home at a drastically reduced price in the peaceful town of Amityville, New York. The house's history of a gruesome family murder seems of little concern to the happy family, eager to start their lives in the spacious colonial building. As the Lutzes settle into their idyllic domestic setting, bizarre and terrifying events begin to unfold—each more inexplicable and frightening than the last. The family soon learns the true reason behind their home's markedly low price and the dark, malevolent force that still resides within its walls.

From the onset of their residence, the Lutz family is plagued by a series of supernatural occurrences: unexplained cold drafts, foul odors with no discernible source, and an unsettling series of nightmarish visions. As George's behavior becomes increasingly erratic, and the wellbeing of the entire family appears in peril, they reach out to the Catholic Church for help. A local priest attempts to bless the house, only to be repelled by an unseen entity, leaving the Lutzes to confront the evil presence on their own. The Amityville house's oppressive atmosphere continues to escalate, threatening the sanity and lives of its inhabitants as they try to uncover the origins of the haunting and seek a way to escape the overwhelming terror.