I read the hell out of this book.

Continuing on immediately from The Answer, Rachel attacks the Yeerks in control of the Blade ship, and kills Tom and his Yeerk, before dying at the hands of his Yeerk allies shortly after; the Ellimist briefly stops time to memorialize her death, tells his own story to her, and she dies. Tom's morph-capable Yeerks escape in the Blade Ship, abandoning the disabled Pool Ship to the Animorphs. Visser One, realizing that he is defeated, leaves Alloran-Semitur-Corrass's body after being knocked unconscious by Ax. The remaining Animorphs, as well as Alloran (freed after more than two decades under Visser One's control over his body), contact the Andalite fleet, and after hours of negotiations, the Andalite fleet promotes Ax to rank of Prince, and declares the war over. The Animorphs attend Rachel's funeral, where a statue is erected in her honor, and Tobias flies away with Rachel's ashes. It is also revealed that the Animorphs lived in California, a fact that had not been revealed through the course of the series.

The remainder of the book describes the development of the characters over the course of three years after the war. Jake, Marco, and Cassie become instantly rich and famous, while Ax returns to the Andalite homeworld a hero. Surrendered Yeerks are allowed to choose an animal form in which to become a nothlit, and similarly Arbron's Taxxons are granted their wish and become nothlit anacondas or other big snakes, relocated to the Amazon Rainforest. Unable to morph out of his Taxxon form, Arbron is soon killed by poachers. This may have been for the better, as Arbron is finally freed from the Taxxon's hunger. The free Hork-Bajir colony is moved to Yellowstone National Park, and are protected by Toby Hamee and Cassie. Toby becomes a non-voting member of the US Senate while Cassie serves as an adviser to the President. Humanity has also developed an alliance with Andalites. Some developments between the two races are companies such as Microsoft and Nintendo building new electronics and Andalites morphing into humans to experience the sense of taste. Marco embraces his new fame, and winds up becoming the self-proclaimed "spokesman" for the Animorphs, as well as a TV star. Cassie uses her powers in the government to become an activist for the environment and the Hork-Bajir. Jake however adjusts less easily than they do to the new conditions and becomes depressed.

A year after the conclusion of the war, Esplin 9466 (formerly Visser Three and later Visser One) is put on trial in The Hague, Netherlands for war crimes against humanity and is found guilty. Jake has slumped into depression in the year since the war ended, having minimal contact with his friends and not morphing at all. During Jake's testimony at the trial, Esplin's defense lawyers attempt to discredit Jake by claiming that he himself is a war criminal for his actions, such as his emptying of the Pool ship that killed 17,372 Yeerks. Though this objection is overruled, Jake is deeply shaken by it, as he feels that it, along with many of his actions during the war, was immoral or mistaken. In a desperate bid to cheer Jake up, his friends capture him and dump him into the ocean, thinking that by forcing him into a dolphin morph (dolphins being naturally happy) they can cheer him up. Jake remains aloof however. Esplin is forced to live out his remaining days without a host in a purple box (the Andalites constructed the box and had it painted purple for some unknown reason). Two blogs worth, yeah!