 Chris Fujiwara wrote a detailed piece discussing examples of the genre such as "Killer Nun" (1978), "The Nun and the Devil" (1973) and "Flavia the Heretic" (1974), in "Hermenaut", a US pop culture journal.Some films, such as the X-rated "The Devils", based on a book by Aldous Huxley and directed by Ken Russell, have some basis in fact.Huxley based his original historical account, "The Devils of Loudun", on a reported case of mass hysteria and demonic possession that allegedly took place at a French convent in the seventeenth century.