The story is dual POV between Aria and Perry. Aria started the series as a Dweller, a person who lived in a pod to escape the deadly Aether storms. Perry is an Outsider, living in the wilds among people known as savages. In book one, they happened to meet and their lives changed forever. Aria's character arc is flawless. She changes tremendously, mostly for the better. Both characters become more open to the idea of people who are not like them. Old friends and enemies alike turn up in this book, and the characters risk everything they have to save each other. It's fun seeing how Aria interacts with the people she grew up with after living with Perry and the Outsiders for the two previous books. Oh, and there's a new character who I just LOVE! It's also really nice that the angst is GONE! Book two was too angsty for me, but by this point, relationships were accepted, heartbreak was inevitable, and death was a promise to those who could not change.
The plot is phenomenal. The book starts strong and remains that way the entire length of the book. The characters refuse to give up, and keep fighting through every situation. Thank you Veronica Rossi for writing such an amazing book. The one problem I had with the book was towards the end. Basically, I wish there was more information on exactly what happened after the climactic scenes. Where did the characters go, what did they do, what exactly does the ending entail? All in all, a very good book, but the one part that I felt was really important simply wasn't done justice. Even still, I give the book five stars for a great series ending.
P.S. I still think the book should be called Into the Forever Blue, it goes with the theme more.