From the bestselling author of the Thrown Away Children series comes another heartbreaking story of life in foster care. Louise has trouble on her hands from the first moment that 5-year-old Billy Blackthorn comes to stay. He is one of more than 20 children taken into care from a single family, and erupts into the Allen household with a volatility that is frightening and disturbing in equal measure. It is only as Louise begins to uncover the secrets of Billy's dark past that she begins to understand what made his family 'untouchable'.