Free Four: Tobias Tells the Story is a companion short story that recounts Tobias' view of the knife throwing stage in Dauntless initiation in Chapter 13 of Divergent. It shows the basis of how he came to realize his feelings for Tris and his relationship with Eric prior to joining Dauntless.
Roth had many scenes she was choosing from at the time that she was writing this, upon the request of her publishers, she was trying to find the best point of the book, that would define who "Four" really was, as a character. She said that she expected the story to surprise readers, as it surprised her while she was writing it
*This short story was included as a bonus in the Insurgent Collector's Edition, or can be read as an ebook online.