Woo-hoo, the Andalites arrived. Or should we be rejoicing? Urgh, poor Ax. This one totally wowed me. Jake really kicked butts and took names. He's pretty confident as the leader of the secret military of Earth, yes?
Notable moments and inconsistencies:
This book is ghostwritten by Kimberly Morris.
Odd that subordinate Yeerks are cautioning against killing a person because Visser Three will be furious at the loss of a host body. Visser Three constantly kills host bodies unnecessarily. If it was really about preserving hosts, Visser Three would hold a host until the Yeerk inside starved, then re-infest the person with a different Yeerk. Of course, Visser Three is also a hypocrite, so it's possible that he would be angry at an underling doing something he himself would do, but in general he does not act like host bodies are precious.
Usually, if one of the Animorphs is morphing to an animal that shares some characteristics with humans, those features will morph into the animal version (e.g., arms will become front legs, human noses become animal noses, etc.). But in this book, instead of having his ears migrate up to the top of his head like every other morph so far, Jake's tiger ears pop out of his hair before his human ears disappear. This is really an inconsistency, because while there's not a whole lot of logic to morphing in general, it does seem to have some general rules, and this description broke them.
In a previous book, Ax refers to having his second and third heart stop when he becomes a human, leaving him with one heart. This is the first place where it's clearly stated how many hearts Andalites have. But twice since then--once in The Andalite Chronicles and now again in this book--an Andalite refers to "both his hearts." Question is, which account is correct?
When Tobias and Ax find Estrid at the mall in human morph, it's made clear that she nabbed the DNA of another customer at the mall because they see the same person there. But it's never made clear how the heck an Andalite got into the mall to acquire a kid's DNA.
The Andalites the group meets in this book are named Estrid-Corill-Darrath, Gonrod-Isfall-Sonilli, Arbat-Elivat-Estoni, and Aloth-Attamil-Gahar. All are male except Estrid.
It seems ridiculous that Jake and the other human Animorphs would go into the Yeerk pool in their actual bodies. Especially Jake, whose brother is a Controller. He has another human form he could have used, though they were short on time. Just seems like an unnecessary, ridiculous risk.