The Amityville Horror
The Amityville Horror is a September 1977 book by American author Jay Anson documenting paranormal claims by the Lutz family, which later became the basis for a 1979 film series.

In depth
What Happened
The Amityville Horror is a book by American author Jay Anson, published in September 1977. The book is based on the claims of paranormal experiences by the Lutz family. Following its publication, the documented history of the work shows that it has led to controversy and lawsuits over its truthfulness. In addition to its literary presence, the work serves as the basis of a series of films released from 1979 onward.
Where the Story Outgrew the Facts
While the original documented record focuses strictly on the claims of paranormal experiences by the Lutz family and the subsequent controversy and lawsuits over its truthfulness, later adaptations and popular retellings expanded far beyond these core events. Subsequent book editions, promotional materials, and the film series released from 1979 onward dramatized, embellished, and fictionalized the alleged occurrences to heighten the terror for audiences, transforming a disputed personal account into a massive commercial horror franchise.
In Horror Fiction
Within the broader landscape of horror fiction and literature, accounts of haunted houses and supernatural claims occupy a prominent space. While Jay Anson's work stands out as a publishing phenomenon based on supposed real-life events, the genre features numerous landmark novels that explore similar themes of domestic terror and malevolent entities. Notable examples in this tradition include The Haunting of Hill House by Shirley Jackson and The Shining by Stephen King, both of which examine the psychological and supernatural deterioration of individuals within isolated, haunted environments.
Why It Still Haunts Us
The enduring fascination with the subject stems from the blurred line between reality and imagination. Because the book is based on the claims of paranormal experiences by the Lutz family, it taps into a deep-seated human anxiety about the safety of the home. Even as the work has led to controversy and lawsuits over its truthfulness, the combination of a bestselling 1977 book and a film series released from 1979 onward ensures that the cultural memory of the haunting remains as potent as ever.
Source: Wikipedia