A heart-pounding race against time, I really enjoyed this book!So the plot goes back and forth between the kids that leave and the kids that stayed behind at the store. If you have not read the first book, I suggest you do. Told from different point of views, each set of kids faces much trouble ahead of them. The plot never fails to give good entertainment and within the first few chapters, the reader has a good feel for plot. I really like that in this book you can really tell the growth difference. In the first book, all of them were scared and unsure what to do. In this book, the situation has forced them to grow up. They are no longer scared but know exactly what do. They don't take any chances. Now, the love interest between Dean and Astrid gives the reader time to move away from the craziness of the world and enjoy some teenage love drama. I can imagine in that time and place, how hard it would be to be in a relationship on top of all the other secrets as well. Both of these characters had to grow up quickly and in that, they play grow up parts. Sometimes their relationship is not even a teenage relationship but that of grown adults. Given the situation that their in, I think the author did a great job in creating an atmosphere where the kids aren't kids anymore.Sky On Fire is a great sequel that opens the reader eyes to the harshness of the world. Featuring a great plot and worthy characters who put everything they known behind them, Sky On Fire is amazing and compelling.