Fourteen-year-old Will doesn’t think he has much in common with his family. Nothing, that is, except a strange passion for digging which he shares with his father. But one day, Will’s dad mysteriously vanishes down a tunnel – part of London’s vast, labyrinthine underground system. With his friend Chester, Will decides to investigate. But soon the boys find themselves deep in darkness, unearthing a terrifying secret which may cost them their lives… This riveting bestseller oozes the mysterious fascination of the underground and all its hideous possibilities. Creepy, tantalising and original, it’s full of thrills to keep you burrowing in!