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Codaria's repair systems are out of control: functions are being called twice, three times, eight times - duplicating across the entire world. A single bug deep in the Function Forge is causing exponential chaos, and the Forgemaster needs help. Maya, Leo, and Jaya must journey to the great forge where all of Codaria's functions are cast, learn what a function really is, and rescue an ancient recursive Echo that has been calling itself for two days. Along the way they master parameters, return values, pure functions, side effects, and the elegant power of recursion. Book five of the six-book Code Quest Chronicles introduces the most important organising principle in all programming - the function - through a warm, illustrated adventure. Ages 10-14. British English. No screens required.