In a condemned medieval London church, a demolition crew uncovers a walled up chamber with a skeleton inside. Black liquid crawls out of it and makes a haunted hose choke to death one of the workers. A skeptical police inspector is brought in but he deems the death an accident. However, a female journalist tries to convince him that there’s more to the church than it seems.
Meanwhile, a young man who feels a strange connection to the building tries to sneak in with his girlfriend. An old priest reveals that in the 17th century, the church was once used by a Satanic cult led by a Satanic priest until one of the cultists had a change of heart and betrayed the coven to the church which led to some of the cultists being caught and burned alive at the stake. Just before dying, they vowed revenge against both the traitor’s descendants and the church itself.

Production Details
© 1984 Twentieth Century Fox Film Corporation, All rights reserved
The characters and incidents portrayed and the names used herin are fictitious and any similarity to the name, character or history of any person is entirely co-incidental.
Produced by Hammer Film Productions Limited
ITV London Transmission Date: 4th July 1985
Locations:
St Andrews Church, Woodwalton, Cambridgeshire – Church undergoing demolition
Western Dock Development, Wapping, London – Construction site surrounding church
Coombe Wood, Shenley, Radlett, Hertfordshire – Fields where witch-burning scenes take place
First, Second and Third Avenue Plaistow, London – Terrace street scenes, and exterior of Granny Water’s house
Barnes Street, Limehouse, London – Interiors of Granny Water’s house
Shenley Hospital, Radlett, Hertfordshire – Psychiatric hospital
Stills from episode
Click an image for enlarged slideshow
Cast & Crew
Cast – Complete, awaiting verification
Footnotes
Gareth Hunt played Mike Gambit in the ITV series The New Avengers (1975).
Carol Royale starred in the television comedy series Life Without George (1987-9).