Amityville 3D (also known as Amityville III: The Demon) is the third film in The Amityville Horror movie saga, released in 3D in 1983. This was the first Amityville film to not be based on or inspired by the so-called "true story" of the original book and movie.
John Baxter, separated from his wife, moves into the infamous Amityville House with plans to debunk the haunting myth for a newspaper article. The longer he stays in the house, however, the more he comes to believe that tales of the house's possession might be true. When his daughter dies in a boating accident nearby, his wife sees her alive in the house. Baxter calls in a paranormal investigator to help, and together they discover more of the house's terrifying secrets... in 3D!