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.
Dr. John Holden
Joanna Harrington
Dr. Julian Karswell
Professor Henry Harrington
Mrs. Karswell
Professor Mark O'Brien
Mr. Meek
Lloyd Williamson
Mrs. Meek
Rand Hobart
Inspector Mottrarn
Detective Simmons
Chemist
Librarian
Farmer
Hobart's Brother
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