This was seriously one of the best endings I have ever read. While I am incredibly sad to know that this is the last book in the Gallagher Girl series, I know for sure that I'll be re-reading this series over and over again because it is just that amazing. Honestly, I was so worried about how this book was going to end. I had this lingering fear that not everyone would live to graduate, and that a certain relationship might not survive. While I don't want to spoil anything, I can say that I am totally happy with the turn of events in this book. People have changed, but it allowed the book to feel more realistic because the reactions of the characters (and how they're affected by events) is so true to life, it's scary. 
 Ally Carter has elevated this series to a whole new level. When we first were introduced to Cammie, she was just a fun-loving, kick-ass spy girl and we were taken on cute adventures. I never would have seen where this series was going, but I am so glad at the direction Ms. Carter took it in. The last couple of books have been much more serious, especially Out of Sight, Out of Time. However, this book took the seriousness into a new ballgame. It was full of action, and so many twists and turns that we are left dizzy. I figured out some of the twists, but I was surprised by most of them, especially when it came to the end. And even though some of it is easy to figure out if you pay attention and put 2 and 2 together, it's still an amazing read that you never want to end. One thing that I absolutely loved though was the ties back to previous books. The little mentions of what happened in the first book with Josh, or when Cammie first met Zach, it just made me full of nostalgia and took me back to when these books first came out and I was reading them for the first time, waiting to see the awesome spy world that Ms. Carter created unfold before me. Ms. Carter has truly grown as an author from her first book, and this book is no exception. She showcases her amazing talent, and I can't wait to read everything else she writes. 
 Nevertheless, the truly outstanding and stand out part of this book is the characters. Cammie has grown so much over the course of these novels. She is stronger, smarter, and finally coming to terms with everything. Bex is Bex, Macey is Macey, and both are better than ever. We get to see more emotion from both of their characters than was shown in previous books, and it just made their characters feel more complete in many ways. But, what I liked the most was that Liz was more present. She went on heart-pounding missions with everyone, and it was nice to see Liz, Cammie, Bex, Macey, and Zach all working together. You're constantly rooting for these characters that you have loved from the very beginning. You, along with the characters, don't know who to trust, and that's both a brilliant and very scary thing. I choked up with Liz's graduation speech. I felt as if I was actually listening to it in person and hearing the emotion in her voice. It was simply remarkable. 
 I was lucky, and purchased the book from B&N, so I was also treated to a short story. It was a sweet way to end things, and it gave me that last little bit to hang on to with the characters. Thank you Ms. Carter for bringing these characters to readers. You deserve a huge hug! Throughout this book, I laughed, cried, and by the end, I was actually okay with saying goodbye to the characters because (besides the great ending that was very complete) I know I'll be saying hello to these characters again very soon when I re-read the series. This is definitely a must read! Happy reading :) 
 5++++++ stars