The Yeerks are finally beginning to suspect human morphers and have started making use of the plentiful DNA samples the Animorphs leaves scattered around every time they battle.
This DNA cross-referenced with blood banks, the animal exhibits at the Gardens, and other sources, inevitably will point towards one or all of the Animorphs.
A hard decision has to be made, but sacrifices are about to be made. Complicating matters, Tobias discovers that the strongest DNA link in the Yeerk computers points to his birth mother, who had left his life long ago. Can he leave her to the Yeerk's mercies?
This was nicely done.
Next: 'The Ultimate'
Previous: 'The Return'