The Traitor (Divergent, #0.4)

The Traitor takes place two years after The Son and runs parallel with the early events in Divergent. In this robust story, readers follow Tobias as he uncovers the details of an Erudite plan that could threaten the faction system, and makes plans of his own to keep Abnegation safe. At the same time, Tobias is getting to know a new transfer initiate: Tris Prior.