The book is known to have been ghostwritten by Laura Battyanyi-Weiss.
Jake returns from school to discover that his great grandfather has died. His father insists that the family go to his home in a wooded cabin far away and help plan the funeral arrangements. They plan to be gone for three or four days; however, this presents a problem for Tom, who can not stay away from the Yeerk Pool for more than three days at time. Tom fights relentlessly with Jake's father about going and when they leave for a Sharing meeting together Jake fears that Tom may force their dad into involuntary Yeerk infestation, or even kill him. Jake must save his father, but for the first time, his quick thinking tactical mind freezes up. A slight power struggle ensues between Jake and Marco who insists that Jake isn't thinking clearly on this matter. After several close calls protecting Jake's father, the Animorphs decide to make a distraction for the Yeerks so that Tom is no longer their top priority. The Animorphs kidnap Chapman holding him hostage in an abandoned house to distract the Yeerks from taking care of Jake's father. To make the kidnap seem convincing they have Ax interrogate Chapman for hours. Afterward, they allow him to escape, and Ax insists that he will never do such a thing again as it is not the conduct of a warrior. After this Jake insists on handling the situation by himself. With the distraction successful, Tom heads up to the cabin with the rest of the family. In the middle of the night, he tries to kill his father with a dagger, but is stopped by Jake with the help of rest of the Animorphs, who are running a plan devised by Marco. Tom is injured and taken back to the hospital in the city where he has access to a Yeerk pool.
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.