Saint Maud review – nursing a nightmare of erotic intimacy | Peter Bradshaw’s film of the week

Morfydd Clark is superb as a troubled caregiver in this extraordinarily scary horror melodramaLast year, Morfydd Clark appeared in Armando Iannucci’s new version of David Copperfield playing both David’s mother and the woman he’s in love with – a Freudian-doppelganger performance so coolly understated that many didn’t realise it was happening, or quite why they found Clark’s appearance(s) so disquieting.

Well, there’s nothing understated about her now, and what a sensational breakthrough in this extraordinary horror melodrama from first-time feature director Rose Glass.

Clark gives an operatically freaky turn that knifed me in the kidneys, the way Catherine Deneuve did in Repulsion or Emily Watson in Breaking the Waves.

And her final split second on screen is the equivalent of brutally pulling out the knife to start the internal bleeding.It’s a scary movie that is also a satirical nightmare about the

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