Anna Covey is a 'Surplus'. She should not have been born. In a society in which ageing is no longer feared, and death is no longer an inevitability, children are an abomination.

Like all Surpluses, Anna is living in a Surplus 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?

A tense and utterly compelling story about a society behind a wall, and the way in which two young people seize the chance to break free.