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Lux Fischer and Sparrow Highwater have a big problem. They've grown up reading adventure books. Now, they're living in one.One day, walking home from school, Lux finds a strange, glowing ring. The magic it contains doesn't seem to follow any rules. And before she knows it, the ring has transported them on an adventure through time and space - threatening all of reality in the process.That means Lux and Sparrow have to save not just our world, but all the worlds that have ever existed- but can they even manage to save themselves?