My favorite of the trilogy! Each book has been successively better in holding my interest, to the point where I nearly snuck this book into class to keep reading it.
Alek has really come into his own in this book - while Deryn was much more the driver of the action in the first two books, Alek takes prominence in Goliath. But what I really love is Alek and Deryn's friendship/relationship, and we finally get a resolution to the secret Deryn's been keeping. And what a resolution! I loved the ending.