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(4)
4-6
This fourth book follows aptly named Will Burrows (Tunnels, Deeper, Freefall) and his friends as they traipse back to the world at Earth's core and to Topsoil. Though the story line attempts to follow too many characters--including clever heroes and even more interesting villains--the book's fast-paced action will sustain fans. Readers are again left hanging off a cliff at the end.