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The Fear Man by "Ann Halam", YA pseudonym of multiple award-winning British sf/fantasy author Gwyneth Jones (
ISFDB,
Wikipedia), #3 in her Ghosts and Other Hauntings series of kids/YA sf/fantasy/supernatural adventure/suspense thrillers, originally out from Orion in 1995.
A dreadful secret hangs over the deserted house on Roman Road. What is it that keeps drawing Andrei to it? Why is his mother so afraid of the place? And what is the unknown presence, not human, not a ghost that seems to be stalking the family: Andrei and his mother, his little sister (who believes she can do magic) and their baby brother? Andrei's mother has been constantly on the run from the father he's never met, for as long as he can remember: but now the nightmare is closing in, and it's time to turn and face the monster. Whatever that may cost.
Crying in the Dark, #5 in the series, originally out from Orion in 1998.
Bullied and abused by her adoptive family, a holiday on the edge of Dartmoor, in the depths of the country, is just another ordeal for Elinor. But then her aunt forces her to sleep in the dark little room with the four-poster bed, a musty prison of curtains where strange dreams await . . . Elinor retreats into the past; into the tragic life of another Elinor, poor Nell the nurserymaid; and into a three-hundred year old story, at first fascinating, then terrifying. She's trapped in a nightmare, and the price of escape is to terrible to contemplate . . .