In the 1970’s Doris Bither claimed, among other ghostly happenings, to have been sexually assaulted by three ghosts. Her case inspired a 1978 novel by Frank De Felitta titled The Entity and a film of the same name. The case parallels other popular “based on a true story” horror films of the time—including The Exorcist and The Amityville Horror—blending themes of paranormal investigation, tormented victims, and evil spirits.