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