It was really quite interesting to start the second book of the Divergent series. It had been so long since I had read Divergent that I couldn't remember how it left off. As I read Insurgent, everything came back to me. I couldn't give this book five stars, even though it was still really good. There's still a lot I don't understand about the world Veronica has created. The ending of Insurgent helped a little to give me a better understanding, but still not enough. It was the lack of world-building that I had a problem with in the last book as well.The characters were what held my interest. Tris and Tobias were both similar, but so different. Either Tris is self-sacrificing or has a death wish. I haven't quite figured out which one yet. Tobias kind of does everything for a reason - even if it's for the wrong reason. He's also the one who tries to rein Tris in, with pretty much with no success. There's an element of mistrust between them, although you can see they're clearly attracted to each other. I think that's what I like about them. They're not all 'I love you, let's slobber all over each other, even if I don't agree with what you're doing or saying'. They seemed more real to me.I also loved the complexities between some of the minor characters as well. There were a lot of characters I loved, others I loved to hate, and a lot I certainly didn't trust, but I think that's what made it so good. It was real.I also enjoyed the ongoing plot of this book. The flow was smooth, as in it wasn't too fast or too slow. It didn't give me moments where I was bored, thank goodness.On the whole, I thought it was a very enjoyable read and I am looking forward to the next book, that's for sure.