Night of the Demon is a 1957 British horror film. An adaptation of M. R. James' Casting the Runes (1911), the plot revolves around American Professor John Holden going to England and investigating a Satanic cult suspected of being responsible for more than one death in recent months.
American professor John Holden arrives in London for a parapsychology conference, only to find himself investigating the mysterious actions of Devil-worshiper Julian Karswell.