Steven Lamb digs holes on Exmoor, hoping to lay to rest the ghost of his uncle, who disappeared aged 11 and is assumed to have fallen victim to the serial killer Arnold Avery. Only Steven's Nan is not convinced her son is dead. Steven is determined to heal the widening cracks in his family before it's too late. And if that means presenting his grandmother with the bones of her murdered son, he'll do it.
So the boy takes the next logical step, carefully crafting a letter to Arnold Avery in prison. And there begins a dangerous game between a desperate child and a bored serial killer. A game that will have more terrifying consequences than Steven could ever imagine.