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The Bewitching of Alison Allbright by Alan Davidson, a suspenseful YA coming-of-age fable originally out from Penguin's Viking Kestrel imprint in 1986.
Alison Allbright has always sought refuge in day dreams - of having a glamorous mother and a lovely home, of being an exciting person, of doing all the things that the others at high school do - and more. When Mrs Considine appears, spinning her amazing web of fantasy and making those dreams come true, Alison is completely bewitched....until she discovers the catch.