The Hork Bajir Chronicles By K A Applegate

(Animporphs Chronicles # 2)

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Chronicling the lives and fortunes of Dak, a Hork-Bajir Seer, born to save his people from a Yeerk invasion and Aldrea, a female Andalite, sent to the Hork-Bajir planet after her father's misguided kindness gave the Yeerks their power.