Book Review of The Threat (Animorphs, Bk 21)

The Threat (Animorphs, Bk 21)
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what happened to the blue box? nobody knows, exept david. when evil invades his home the animorphs are forced to make a decision. they make him part of their team. but what happens when your mistake is more powerful than you,. david is loose, and dangerous, and that mistake could cost tobias his life