A thrilling adventure story about a mysterious underground world, read by Jack Davenport. Fourteen-year-old Will Burrows lives with his parents and younger sister Rebeccain London. He has little in common with any of them, except for a passion for digging, which he shares with his father, a museum curator and doctor of archaeology. When his father suddenly disappears after a row with his mother, the police believe he has just gone away for a while to cool down. But Will is unconvinced, and decides to investigate with his best friend Chester.