A new look for the first book in Roderick Gordon and Brian Williams's bestselling series!
Fourteen-year-old Will Burrows lives with his family in London.
He has little in common with them except for a passion for digging which he shares with his father.
When his father suddenly disappears down an unknown tunnel, Will decides to investigate with his friend Chester.
Soon they find themselves deep underground, where they unearth a dark and terrifying secret - a secret which may cost them their lives ...