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.

• Sabre Film Productions Ltd.
• Dana Andrews
• Peggy Cummins
• Niall MacGinnis
• Maurice Denham
• Athene Seyler
• Liam Redmond
• Reginald Beckwith
• Ewan Roberts