I loved the discovery of other factions, their lifestyles, their beliefs. I liked the characters from different factions interact. I liked all the scenes between Tris and Tobias, their romantic moments like their disputes. I liked Tobias remaining mentally strong when all its dark world into chaos: the forced cohabitation with his father, to rediscover his missing mother and Tris ... which is so upset by his own actions that n ' is a shadow of itself. And then I liked to see all these characters barely sketched in Volume 1 as Uriah, Zeke, Lynn, Marlene, Cara, etc ... and the light tone that some of them bring to the story. In Volume 1, only Christina brought a touch of humor with his outspokenness. In this 2nd volume, it is now joined by Lynn, and especially Marlene Uriah. Even Tobias gets to make us laugh!
But that Volume 2 is also a lot of shares, twists, doubts, misunderstanding, uncertainty, it never stops to the point that releasing the book becomes very difficult (and days at work all the more because of lack of sleep: p).
In short, I love it and I'll say I want more if I did not already know what is in the Volume 3 ...
Anyway, I do not know if I will come to make you want to read that book but in any case, me, it made me want to read it! ;-p