Extra Geography begins with a borrowed premise so silly it could only work: two Year 10 girls at a northern boarding school decide, on a slow afternoon, to fall in love with the first person they see — their geography teacher, Miss Delavigne, sturdy ankles and all. What playwright Miriam Battye understood from Rose Tremain's original five-page story is that the premise isn't really about the teacher. It's about Minna and Flic, and the enormous, unstable, romantic weight of their friendship with each other. Tremain's source material is semi-autobiographical — she and her schoolfriend Heather really did develop a mild crush on a geography teacher called Miss Howard in the 1950s, tried to do well at geography, and got no further. What Battye, who served as story editor on Succession Season 4, did with that seed is expand outward into the social architecture that makes such crushes possible: the boarding school as a sealed system, pre-smartphone, pre-porous, where a fortnight of boredom and ambition and proximity can feel like a whole life. Battye attended an intense all-girls school in the north herself, and she brought that specific register of ferocious, impatient ambition into the script. The characters — Minna, the effortless posh beauty, and Flic, the scholarship girl who compensates with brains — aren't types. They're the kind of girls who ask 'What if we don't get into Oxbridge?' and answer 'Maybe we'll just die' without a trace of irony. Battye's dialogue has the same quality as Succession's boardroom exchanges: every line is doing work, nothing is mumblecore, nobody is improvising their way to meaning. Director Molly Manners, making her cinema debut after leading the One Day adaptation for Netflix, shot the film in a dilapidated North Yorkshire country house she and the crew called the 'cold cradle' — no pastoral care, no useful adults. The pre-social-media setting (early 2000s, payphone, 15 minutes to your parents) is structural, not nostalgic: it seals the petri dish. The rude interruption of boys from a neighbouring school arrives like weather, and the film uses that weather to clarify what was already there. Casting director Lucy Pardee and Manners spent months trawling drama clubs; they found Marni Duggan, 19, as Flic, who says she would have been unable to watch the film had she not got the part. Tremain, speaking from Norfolk, says Battye 'completely understood it and yet made it her own' — which she describes as rare in cinema adaptations of her work, given what happened to Restoration. She is right to be surprised, and right to be pleased. The film is not a relic dressed up. It earns the Jane Austen and Ferrante comparisons critics have reached for not because it imitates those registers but because it shares their conviction that the social world of women confined together produces emotions of genuine epic scale. Manners says she wanted the feelings to be 'huge' — and they are, without the film needing to raise its voice to achieve it.