The book is based on the 28-day period during December 1975 and January 1976 when George and Kathy Lutz and their three children lived at 112 Ocean Avenue.
Buku ini berdasarkan kisah selama 28 hari, dari Desember 1975 hingga Januari 1976, ketika George dan Kathy Lutz tinggal dirumah keluarga DeFeo di 112 Ocean Avenue.