After reading this I have one question...Why did I wait so long to read this? I want to gush...I really do, but I don't think I can come up with enough words to substitute for awesome.Everything is so well done in this book. The world that Roth has created is very believable and slightly chilling. At first I wasn't sure about the faction aspect, I found it be confining and unfair...but then I kind of realized that was the point. I loved the fact that it's set up in such a way, and that the factions have different rules and personalities makes it even better. The characters are also wonderfully realistic and not just one dimensional plot devices. I think that the way this is written really goes a long way to give you true insight to what's going on. I mean at times I even felt nervous for the main character, Tris. There is a lot that goes into the characters and even the ones you rarely see feel real. These people have flaws and their actions have consequences, and not just to their surroundings but mentally as well. Four is by far my favorite character in this, which I suppose is hardly surprising to those who've read it. Tris is a pretty close second though, and I could only wish I were as strong as she is at times. The romance that occurs is also very well done and doesn't feel rushed or fake at all. The timeline feels real and the interactions between the two are perfect for them. There were times when I had to stop reading and simply gawk at the page for a bit before everything kind of sunk in.This is action packed and gripping, and I've lost more then a few hours of sleep reading this one. I want to say more on this, but I fear if I do I'll give away some part of the plot and I don't want to ruin this for anyone. It's capable of the element of surprise and I don't want it to loose that. I recommend this completely! A bit of content warning so I'd keep it 16 and up, or so. I can't wait till the next one comes out!