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.
Dana Andrews
Peggy Cummins
Niall MacGinnis
Maurice Denham
Athene Seyler
Liam Redmond
Reginald Beckwith
Ewan Roberts
Peter Elliott
Rosamund Greenwood
Brian Wilde
Richard Leech
Lloyd Lamble
Peter Hobbes
Charles Lloyd Pack
John Salew
Janet Barrow
Percy Herbert
Lynn Tracy
John Harvey
Alan Beaton
Hyma Beckley
Ballard Berkeley
Ernest Blyth
Wallace Bosco
Daniel Brown
Jimmy Cains
George Curtis
Richard Duke
Shay Gorman
Laurence Hepworth
Walter Horsbrugh
Arthur Howell
Anthony John
Dan Lester
Leonard Llewellyn
Michael Peake
Paul Phillips
Anthony Richmond
Peggy Scott Sanders
Terry Sartain
Leonard Sharp
Bert Simms
Robert Brooks Turner