I should probably have waited another month or two to read this one because now I have to wait until September for the third book in the trilogy, and I don't want to wait. 
 I didn't enjoy Authority as much as I did 
 Annihilation 
 , but I did like it, and it did leave me hungry for the third book. It's darker than the first book, not in mood but in the sense that I can't visualize the setting as well as I could with the first book. Both books deal with deceptions and with situations in which you can trust no one, but whereas the setting itself is untrustworthy in Annihilation, in Authority it's human relationships and human institutions one can't trust. Throughout the book, I was never sure quite whom to root for. I seem to default to rooting for Area X, although I'm not sure I want to know what that says about me.