Is it coincidence, homage or plagiarism that the central duo in Carol Morley's film bear a striking resemblance to Kate Winslet and Melanie Lynskey in Peter Jackson's Heavenly Creatures?
The film is, after all, about teenage hysteria (well, I think that's what it's about), though the obsessive relationship between Lydia (Game of Thrones' Williams) and Abbie (Pugh) is interrupted early by a tragic and unexplained event, which I suppose I am obliged not to spoil for you.
The story is set in a small, prim girls' school in rural England in 1969. Lydia and Abbie are the very best of buddies (they embrace like long-lost sisters after any separation lasting more than a few minutes and carve their initials into an oak) and each is rebellious in her own way.
Sexually adventurous Abbie gets up the duff in reel one ("He had a car; what can I say?" she explains) and her libidinal curiosity soon extends to Lydia's brother Kenneth (Cole), whose relationship with his sister starts out suspect and gets worse.
Bristly Lydia meanwhile is defiant to her teachers and her apparently agoraphobic mother (Peake), a chain-smoking housebound cliche in pancake makeup.