Animorphs Book 19: The Departure by K. A. Applegate

The Departure is my favorite book in the main series. It pulls together tensions that have been building since the start, and bends the book structure to achieve something magnificent, poignant, and challenging in an amazing way.

I've been looking forward to reading this again since I started this re-read/review thing. There are a couple of later books that come close to being my favorite (and I reserve the right for one of them to topple this one), but I've really gotten to appreciate how much groundwork in the previous books comes together to make this story feel inevitable, necessary, and brilliant.