I read this book in one day. I read this book when I should have been doing other things. I read this book into the night when I should have been sleeping. It's really a 4.5 star rating, but goodreads won't allow that. 
 I loved all of the characters; major and minor, good and evil. Tris' struggles with who she is and what she will become were well written as well as her initiation into her faction. Some of the choices she has to make are hard, and remind me a little of Katniss in The Hunger Games. The simulation scenes for both Tris and Four had good detail and kind of creeped me out at times. There was a lot of action at the end but there was a fair amount throughout it as well. 
 What was missing? I wanted to know more about the world. The factions are located in Chicago, but what about the rest of the country? The world? Outside of Chicago is never mentioned. I also wanted to know more about the other factions. Amity and Candor are only mentioned briefly and Erudite only slightly more than that. I also wanted to know more about why the factions were created in the first place. I know that they were created for a better world, but what more happened that they needed to be created in the first place? Hopefully Insurgent will answer these questions.