I agree with our book club's consensus of this book: the first 2/3 are the best parts. Scary, mysterious, you're not sure what's going on but you're happy to drive along with Keisha and experience the weirdness and the terror and follow the clues as she tries to find Alice.
Then they try and put a face/give a name on/to the baddies and it loses some of its luster.

Spoiler

And the final battle just seemed rushed. How in the world did Praxis "win" with their lack of guns and their inexperienced fighters? What even was Thistle's endgame? They spoke about them having the government in their pocket and could make them look the other way, and yet they choose to kill truckers on the roadside? Why aren't they killing more influential people? I understand they're also killing people that are getting too close to uncovering their secret, BUT WHAT IS THAT SECRET?? We aren't told. Instead we have this brief, confusing battle, and then a sweet ending (which I was glad for).

Yes, yes, I understand it's possibly an analogy of people in today's society turning a blind eye to evil and how we all know war is happening and people are dying but just choosing to not act feeling we can't do anything to change it. But still....that ending was rushed and unsatisfying.