The beginning's interesting and does its best to hook you in. By the time it passes, you're hooked. It's a little discouraging, though, because of the alien terms they don't bother to discuss elaborately (i.e. Realms, Aether) like with all all post-apocalyptic story lines. 
 The middle gets more interesting. It's one heck of an adventure and also one heck of a build-up towards the undeniable chemistry between Aria and Perry. I mean, it also tackles other stuff like Aria's relationship with her mother, Aria's absent father, Perry's familial problems, Aria's identity crisis, etc. I just... I can't reiterate more how much of a great read this was. I could have finished this earlier, but I didn't want to because I wanted to keep living in their world. 
 All in all, this world was a colorful world to get lost in. I'd definitely love getting lost in it again.