Kip and friends, including unexptected AI allies, must travel deep below the earth's crust to defeat the Grittleshanks once and for all. But many challenges lie in store ... final in trilogy.
When puzzle-loving Kip Bramley receives a cryptic invitation, delivered by a beetle-shaped drone, he has no idea jow his world is about to change. But soon he is at Quicksmiths College, hunting for riddles set 400 years earlier by a mysterious genius. With danger mounting, it seems more is at stake than he could ever have imagined.
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