The collapse and resurrection of the Factions was done very chaotically, perfect for the dystopian book that this is. Everything happens so suddenly. As well, though I was confused at first by the introduction of a second narrator, Four, it was eventually revealed how necessary this was and I would not change it if I was the author. My only complaint is that Four and Tris sound too similar, and I could often not tell them apart until halfway through a chapter. Overall though, this was the best book in the series.