Applegate Katherine Alice. The Animorphs 21. The Threat

After falling from the Blade ship, the Animorphs are snagged from mid-air by Rachel and Tobias, in their respective eagle and hawk morphs. They land on the beach, needing a plan to infiltrate the Marriott resort. Jake becomes aware of the tensions between David and Marco, and is disturbed by David's unnecessary excesses. The team morphs into seagulls, and spy out the area, crawling with security agents armed to the teeth and accompanied by dogs. They're zapped by a security man wearing sunglasses with weak Dracon beam emitters built into them. Jake tells them to leave.Upon his return home, his parents tell Jake and his brother Tom that their obnoxious cousin, Saddler, was gravely injured in a car accident, and that they were leaving town to spend time with his parents. Jake is presented with the opportunity to advance his plans. Unfortunately, that night, David disappears from Cassie's barn. Jake morphs into his dog, Homer, and tracks David's scent to an inn. David had morphed into a golden eagle, smashed the window with a rock and entered a room without paying. Jake warns him of the consequences of this action, while also saying he won't have time to help David with his living problems until after the mission. David doesn't hide his contempt, but leaves with Jake anyway.Cassie formulates a plan to infiltrate the resort. Jake morphs into a dragonfly, while the other Animorphs, with the exception of Tobias, morph into fleas and latch onto Jake's body. Tobias guides them to the hotel. Inside, Jake tries to find the banquet hall where the speeches and infestations will take place. Inside an air vent, he gets caught in a spider web. Terrified, Jake demorphs, and the others follow. Cassie is badly wounded when Jake's demorphing creates a human artery that forces more blood into her flea body than it is prepared to hold. He releases them, and they begin demorphing. Marco is stuck mid-morph, as a giant flea. They begin to despair, but Cassie guides Marco and enables him to demorph. Marco then becomes emotional, something very unlike him.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.