Anna Covey is a 'surplus'. She should not have been born. In a society in which aging is no longer feared, and death is no longer an inevitability, children are an abomination. Like all surpluses, Anna is living in Grange Hall and learning how to make amends for the selfish act her parents committed in having her. She is quietly accepting of her fate until, one day, a new inmate arrives. Anna's life is thrown into chaos. But is she brave enough to believe this mysterious boy? This is a tense and utterly compelling story about a society behind a wall, and the way in which two young people take the chance of breaking free.