Gr 6 Up—As the diabolical Karl Strand plans to conquer the world with an army of high-tech soldiers, Aluna and her friends decide to infiltrate the enemy by posing as Upgraders.
Aluna and her friends disguise themselves as cyborg Upgraders in order to destroy Karl Strand once and for all. To win the war, however, they will need to strengthen existing friendships and forge new alliances among their world's diverse beings. This concluding installment, which features believable world-building, fast-paced action, and engaging characters, wraps up the series nicely.
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