Directed by Lawrence Gordon Clark and adapted by Clive Exton, this ITV Playhouse episode is a masterclass in creeping dread delivered at a polite British pace. Gone are the blood fountains and exploding heads of Italian exploitation; here, terror whispers through corridors, rustles through library shelves, and occasionally manifests as a giant demonic spider in someone’s bed—because nothing says “I’ll haunt you” like arachnids with an eye for dramatic timing.
Jan Francis stars as Prudence Dunning, a television producer whose career in investigative journalism quickly turns into a career in survival horror when she mocks N.I. Karswell, the very definition of a wealthy American occultist with too much time and a taste for revenge. Karswell, portrayed with deliciously restrained menace by Iain Cuthbertson, embodies the slow, inevitable creep of doom—like a tax auditor with a grudge who also happens to know a lot about runes.
The plot is a delightful mix of intellectual dread and bureaucratic nightmare. Karswell doesn’t just curse Prudence with a voodoo doll or a random hex—he orchestrates an entire sequence of unnerving events that include cryptic library interventions, creepy captions appearing on TV, and enough ominous parchment-shuffling to make Indiana Jones sweat. The suspense is built with a subtlety that feels almost cruel: you know Prudence is doomed, and every polite knock, every neatly stacked book, is a reminder that death is coming for you—and it probably brought paperwork.
The supporting cast is impeccable: Bernard Gallagher’s Derek Gayton provides the rational, helpful human anchor (and, frankly, the only person whose job doesn’t involve walking into obvious death traps), while Joanna Dunham as Jean Gayton delivers the sort of casual exposition that makes you wish your friends were just this helpful when you were about to be murdered by a supernatural sociopath. Edward Petherbridge, as Henry Harrington, reminds us that family gatherings can be deadly serious if someone in the room dabbles in dark magic.
What’s truly remarkable is how Casting the Runes balances dread with the sort of dark humor that only British television can pull off. The concept of transferring a deadly curse to someone else by simply handing them a piece of parchment folded into a plane ticket is so elegant, so absurdly bureaucratic, that you half expect Prudence to offer Karswell a cup of tea while she does it. Death has never been so polite—or efficient.
This is a ghost story that respects your intelligence, your patience, and your fear of post-war airport bureaucracy. There’s no gore, no nudity, no over-the-top body horror—just the slow, creeping certainty that if you wrong the wrong occultist, your next appointment might be with a demonic spider in your bed, and there’s nothing your union rep can do about it.
Verdict: Casting the Runes is a tidy, deliciously sinister tale that proves British horror doesn’t need blood-soaked Italian villas or 1970s exploitation antics to give you nightmares. Instead, it opts for subtle menace, sharp writing, and the satisfaction of seeing an overconfident, evil occultist die by the very system he sought to manipulate. Polite, precise, and thoroughly terrifying. And yes, it might just make you triple-check any suspicious library books.
If horror had a cup of Earl Grey, this would be it: civilized, proper, and hiding something very sharp just under the surface.
