The title means a plague, and the writer is Nigel Kneale; diseases, particularly amongst farm-animals are a recurring theme in his work, and this one-off entry in a compendium of plays by British dramatists is an ideal introduction to Kneale’s work. It’s a story about witchcraft that adheres to no genre conventions; the exploration is deliberately un-sensational, thoughtful and intellectually rigorous. David Simeon plays Alan Crich, a vet called on by a farmer (Bernard Lee) to investigate a blight on his animals. Crich discovers that the locals in a nearby village also suffer from an ailment, and that the superstitious villagers blame an old woman who lives alone. Scoffing at their ideas of witchcraft, Crich investigates, but what he finds challenges his own world-view. Kneale’s work here is considerably better than his script for Hammer’s 1966 film The Witches, and John Cooper’s direction makes good use of atmospheric outdoor sets. Murrain sees Kneale releasing himself from the science-fiction angle and focusing on an examination of fear and tradition in a primitive English village. It’s well acted, deadly serious and a minor gem of bleak 1970’s horror.