The film begins with paranormal investigators Ed and Lorraine Warren documenting the Amityville murders at the Amityville house in 1976, to determine if a demonic presence was truly responsible for Ronald DeFeo Jr. mass murdering his family on November 13, 1974. During a seance, Lorraine is drawn into a vision where she relives the murders and discovers a demonic nun figure, before seeing Ed being fatally impaled. After a struggle, Ed is able to break her out of the vision