The Ultimate
Really big trouble is an understatement these days. The war between the Yeerks and the Animorphs is full on - and it's definitely going to get worse. But Cassie, the other Animorphs, and Ax have a lot more going on than just trying to stay alive. Now they've got to actively protect their families and the free Hork-Bajir. And they no longer believe they can do it alone. The Yeerks are just too powerful.

So Cassie and the others have to ask themselves a very important question: Is it time to increase their numbers? They all remember too well what happened with David - the Animorph gone bad. But this time do they really have a choice?
Extraterrestrial beings, Science fiction, Juvenile fiction, Metamorphosis, Fiction
Katherine Applegate
Katherine Alice Applegate is an American writer, best known as the author of the Animorphs, Remnants, Everworld and other book series. She won the 2013 Newbery Medal for her children's novel The One and Only Ivan. Applegate's most popular books are science fiction, fantasy, and adventure novels. She won the Best New Children's Book Series Award in 1997 in Publishers Weekly. Her book Home of the Brave has won two awards. - [wikipedia](https://en.wikipedia.org/wiki/Katherine_Applegate)