You live on a picturesque communal garden square, an oasis in urban London where your children run free, in and out of other people's houses. You've known your neighbours for years and you trust them.

The latest novel from the author of "The House We Grew Up In" and "The Third Wife". A 13-year-old girl is found unconscious in a corner of a communal garden square. But what really happened to her, and who's responsible?