The Answer (Animorphs #53)

In a world where secrecy is paramount, a group of determined individuals faces immense danger as they confront an oppressive force: Visser One, who is constructing a massive Yeerk pool to sustain reinforcements invading Earth. As the stakes rise and the human population becomes aware of the looming threat, Jake and the Animorphs devise a daring plan to seize the pool ship with military support. However, when their alliance falters and they find themselves trapped in the very structure they seek to destroy, salvation may come from the most unexpected ally— the Taxxons.