The conclusion of the Divergent trilogy, but unfortunately each consecutive book seems to make less sense. Characters continue to do blatantly stupid things. The Purity Wars and origin of the faction system are explained, and a new conflict is introduced between the genetically pure and impure, which are all potentially interesting plot points, but there are many baffling questions left unanswered about the whole situation. The decisions Tris & co make to resolve the new conflict are poorly thought out and illogical. Several characters just completely change personalities for no clear reason. Tris has apparently near-magical abilities for no good reason. Four turns into a big baby. And the alternating viewpoint between Tris and Four is just kind of confusing. Ending felt forced and rushed. Overall a disappointing finale to the trilogy.