It is a truly thrilling book that had me on the edge of my seat. I also put this is my other review about "Vortex", I won't say my favorite parts because I'm afraid all of my favorite parts of "Insignia" will be spoiling... But, I could literally NOT put this book down. I decided to read a few chapters a day, and ended up finishing the book in 2 and a half days. It was the exact same way with "Vortex". I really want everyone who hears about this book to read it! I seriously can;t wait for this book explode and be famous! I just know it will become as famous as Divergent. I actually, truly and honestly, like this series more than Divergent! So, read it!