“A good sequel to Divergent, but the ending fell a little flat. Such emphasis was placed on some secret knowledge that the Erudite faction had stolen from the Abnegation faction, but in the end when the knowledge was revealed, it still didn't quite explain everything. Maybe in Book 3?
As conflict builds between the factions, the Erudite use mind-control on the Dauntless to eliminate the Abnegation and gain the secret knowledge for their use. The Factionless are more organized and Divergent than anyone realized.”