While trying to cheat off a classmate's PSAT exam, Marco notices something odd on the kid's screen. Fitey777's chat room. Joe Bob Fenestre. Visser Three's brother, presumed missing. Fenestre tells them the Yeerks are expanding outside California, to New York, and asks for the Animorphs' help to stop them. (A sequel to book 16, set in the modern day. Canon style, Marco's POV.)