The Accidental - Ali Smith

"The Accidental follows a middle-class English family who are visited by an uninvited guest, Amber, while they are on holiday in a small village in Norfolk. Amber's arrival has a profound effect on all the family members. Eventually she is cast out the house by the mother, Eve. But the consequences of her appearance continue even after the family has returned home to London.

The novel was shortlisted for the Orange Prize, the Man Booker Prize and James Tait Black Memorial Prize, and it won the Whitbread Award." - from Wikipedia