Thirteen-year-old Montgomery does not believe in magic. But then, he'd have said people don't live hundreds of metres below London, yet here they are! And in the Underworld city of Lundarien they have eight kinds of magic - the 'Magic Circles'
A terrifying new threat is surging through the Underworld. If Montgomery is going to help save his friends from the fearsome soldiers of Atlantis, he needs to learn fast - even if it means forging the most unlikely of alliances.
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