It’s 1969 and Abbie Mortimer (Florence Pugh) and Lydia Lamont (Maisie Williams) are best friends at a rural English girls’ school. Such best pals that they carve their names together in the ancient oak that overhangs a magical pond and vow never to lose touch. Then Abbie goes and ruins it all by getting pregnant. As if that wasn’t bad enough Abbie’s morning sickness escalates into a fatal bout of fainting and fitting.
Distressed Lydia finds some solace in her occult obsessed older brother Kenneth (Joe Cole), but then she too starts fainting and twitching. Before long all her pals arte doing it as well and then Miss Charron (Morfydd Clark) her art teacher keels over. As Lydia confronts the authority figures around her in an effort to discover the truth, old secrets emerge and Lydia finds herself facing up to a truth she certainly didn’t see coming.
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