- Athene Seyler, Brian Wilde, Charles Lloyd Pack, Dana Andrews, Ewan Roberts, Janet Barrow, John Harvey, John Salew, Liam Redmond, Lloyd Lamble, Lynn Tracy, Maurice Denham, Niall MacGinnis, Peggy Cummins, Percy Herbert, Peter Elliott, Peter Hobbes, Reginald Beckwith, Richard Leech, Rosamund Greenwood
- Jacques Tourneur
- Horror, Mystery
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.