If you've been reading along the Insanity series, volume 4 is a real triumph. The characters get more nuanced, the action becomes inter-continental, and you get more of everything you want in the story! What I really liked about Hookah was the focus on the background of the Pillar. So much of what we've seen of him hinted at things going one way or the other (good or evil, both or neither) and this brought his background and his foreground together to make him a complete character. And because well, the Pillar deserves his book! :-)
I really want to go back and read some more of the original Alice books again (I haven't read them since I was a child) because of how many nuanced and interesting references there are in this book, even while twisting the story in a new direction as we edge closer to the Wonderland Wars. Trying not to spoil anything, the evil side of the Wonderland Wars is growing in scale with some possible "villains with a good side" and "heroes with a bad side" and I really appreciate that. Margaret Kent remains my favorite villain in the story to this point, because I have great empathy for her situation with the queen (I have the same one with my boss!) and because I think she might surprise us along the way. Like the Duchess in the original Lewis Carroll books, she's not all bad and not all good, either.
Lest my entire review be positively glowing, I will say that this story jumps around quite a bit. I read it through the first time as written, then I started jumping around to re-read certain people's stories in the various chapters, and that helped me make sense of some of the more detailed/complicated storylines. I had to do the same thing with the Game of Thrones books, when you have such a huge cast of characters to cover in one story, you've got to move the action along to various characters in the same series of events.
note: I'm a huge fan of any of the Cameron Jace series and received a review copy. I liked it so much I went ahead and bought the final copy as well.