It all started as stories - playground tales handed down for generations. Stories of plague graves, vanished children and hidden steps leading to a festering underworld. A world so real you could almost smell it. But when another child goes missing, Fraser wonders if there's some truth in the tales. The dank tunnels running under the city are real enough. Who knows what horrors their depths contain? Only Billy. He knows about a decaying kingdom far more terrifying than anyone could imagine...