The Accidental by Ali Smith
The Accidental is a 2005 novel by Scottish author Ali Smith. It 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 impact 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.