Unquiet Spirits — K.M. Peyton

Mad is devastated when she's forced to move with her mother from London to a bleak, rural wilderness - until she gets a job restoring the local manor house, Good Graces. There, among the ancient tapestries and furniture, she meets the heir, Simon.

But as Mad and Simon grow closer, Mad realizes her arrival has awoken the restless spirits of the old house. One ghostly presence seems welcoming, but the other is furious - and they are both frighteningly powerful. Mad's relationship with Simon soon spirals out of control, as they are swept up in a tide of centuries-old emotion and rage.