At times it felt kind of clunky in the middle, like it was obvious that this book was a bridge, the middle book in a series. Its own internally driven plot was a little weaker than it could have been. Likewise, some choices were made to forward this plot that seemed a little odd: such as Four/Tobias' behavior. The fighting between him and Tris seemed a little out of character. Tris was an interesting narrator throughout as it was obvious the violence and battle was already getting to her mind. I liked that Roth didn't shy away from the reality of this. I did question Tris' stability a couple times. I am interested to see what this installment means for the rest of the series', and where this story is going overall.