Ghostwritten by Kimberly Morris.
The book begins with the Animorphs and the rest of the inhabitants of the Hork-Bajir valley drilling and preparing for a surprise Yeerk attack. It is clear they are not ready for attack; the parents, particularly Rachel's mother, are having trouble adjusting, and the Animorphs are in disarray. Jake remains cold and distant to everyone; he no longer wants to be the one to make decisions and no longer has a clear idea about what is wrong and right. Cassie tells everyone that Jake wants a camp meeting and tells him about it mere minutes before the meeting is set to begin; Jake reluctantly agrees to have the meeting. Some of the parents express doubt about the Animorphs' actions and fail to realize the necessity of the war. The Animorphs argue that they know best, and they have experience with the Yeerks. They argue that war is the only way, and that everyone should agree to follow Jake's orders. In the end the whole camp agrees that Jake is to be the leader. Jake reluctantly accepts the burden of leader once again, seeing it as his duty because he is the only one who is capable of leading the Earth resistance.
The next morning Jake calls a meeting of just the six Animorphs and they agree that something needs to be done to increase the protection of the camp, and increase the overall size of the resistance. They are no longer in contact with the Yeerk resistance and they don't know how strong the organization is, and the information coming from the Chee seems to be very slow. They recognize that they need more than intelligence; they need a larger force and manpower. They begin discussing the possibility of adding more Animorphs, but none of them has forgotten David, the disastrous last attempt to add a member to the group. However they feel they don't have much of a choice, as the war is clearly shifting to a more open battle, and the Animorphs need more numbers. They agree to use the morphing cube to create Animorphs from disabled teenagers about their age. They decide that it would be best to use kids because they would be more likely to accept the story and are less grounded in reality, and that they ought to use disabled teenagers because the Yeerks would see them as useless host bodies and there is little chance that any of them are Controllers.
Animorphs is an English language science fiction series of young adult books written by K. A. Applegate and published by Scholastic. It is told in first person, with all 6 main characters taking turns narrating the books through their own perspectives. Horror, war, dehumanization, sanity, morality, innocence, leadership, freedom, and growing up are the core motifs of the series.
The story revolves around five humans, Jake, Marco, Cassie, Rachel, and Tobias, and one alien, Aximili-Esgarrouth-Isthill (nicknamed Ax), who obtain the ability to morph into any animal they touch. Naming themselves "Animorphs" (a portmanteau of "animal morphers") they use their ability to battle a secret alien infiltration of Earth by a race called the Yeerks. The Yeerks are a parasitic race of aliens resembling large slugs that take humans as a host by entering and merging with their brain through the ear canal. The Animorphs fight as a guerilla force against the Yeerks, led by Visser Three, and their program to take over the human race. Morphing into animals allows them to battle the various armies of aliens that the Yeerks use, but it also protects their identities. As far as the Yeerks know, only Andalites like Ax have the ability to morph, and if they knew that the Animorphs were mostly human they would be able to easily find out who they are. Protecting their identities becomes more and more difficult as the series goes on because though someone with the ability to morph can change into any animal that they touch, they can only stay in a morph for two hours or they will permanently become that animal. Throughout the series, we see how the war affects the characters in different ways, mentally and physically.