C entred on the unsolved 1945 murder of Warwickshire farm labourer Charles Walton in Lower Quinton, this fascinating and feverish documentary starts under the true-crime umbrella. But it quickly expands, exploring the killing’s influence on the emerging folk-horror film genre, particularly 1973’s The Wicker Man, and almost reaching Adam Curtis -type grand sociology in mining these pop-cultural ley lines for what they say about the British psyche.

After Walton was found on Meon Hill with a pitchfork pushed through his head and a billhook in his neck, rumour soon spread that his murder was ritualistic. When the Warwickshire police called in crack Scotland Yard inspector Robert Fabian to lead the investigation, he was comprehensively stonewalled by the villagers. The notorious case set

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