Animorphs #53: The Answer

The subtle invasion is over. Hoards of Yeerk reinforcements are landing on Earth every day, and Visser One is constructing an enormous new Yeerk pool by blasting giant holes in the ground‹obliterating whatever gets in the way. The Animorphs¹ plan to enlist the help of the U.S. military has failed. Now, Jake and the others find themselves trapped in what will soon be the new Yeerk pool. There is no way out . . . unless help comes from the most unexpected form. The Taxxons.