Night of the Demon
American professor John Holden arrives in London for a conference on parapsychology only to discover that the colleague he was supposed to meet was killed in a freak accident the day before. It turns out that the deceased had been investigating a cult lead by Dr. Julian Karswell. Though a skeptic, Holden is suspicious of the devil-worshiping Karswell. Following a trail of mysterious manuscripts, Holden enters a world that makes him question his faith in science.
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Night of the Demon (1957) is a fantasy, horror, mystery movie running 1h 36m. Starring Dana Andrews, Peggy Cummins, Niall MacGinnis. Rated 7.0/10 on TMDB. Watch it online free on ZapFlix.