Having discovered her true nature, Sal now understands why she's so popular with scientists, and must try to figure out what her place in this new world is--and who she's going to help win the war between parasite and human. 
 The opening chapters were a bit slow, but momentum picked up and then snowballed until it crashed against a cliff at the end of the book (I need the next one now, is what I'm saying). Sal's character development is great to watch; in the last book, she sort of just went along with what was happening to her, but here, she's taking control not only of her own life, but of the entire mess that the world has become. 
 I appreciate that Sal doesn't spend much time in denial or hating herself for what she is; I find books and characters that do that incredibly tiresome. While Sal's not always entirely comfortable with being a chimera, she doesn't try to deny it or the interesting new abilities that come along with it. And she always maintains empathy toward both human and sleepwalker, which puts her in a position to bridge that gap in the next book. I'm excited for it.