The story starts in 1976, with an introductory nod to the case that made the Warrens most famous, in Amityville, the source of a best-selling book and a whole slew of horror movies. allegedly based on true stories. Their reputation spreads to other parts of the world, as the church sends the Warrens to Enfield , a borough of north London, where they set about investigating the home of Peggy Hodgson, a poor single mother, and her four children, whose youngest girl, Janet, is frequently being harassed by what she considers to be malevolent spirit in the form of Bill Wilkins, an old man who died in the home and who forcefully declares his current ownership from beyond the grave. Loud noises, moving furniture, eerie voices, and ugly apparitions increasingly disturb the family until they're at wit's end. Meanwhile, the Warrens are plagued by the vision of a hideous demon in the visage of a scary Catholic nun that is haunting their dreams, while Lorraine contemplates a respite from their demon-busing activities after she sees the grisly death of her husband, Ed, in one of these visions.