This is a short little book, fifty pages or so, on the construction of the Divergent series. There's an interview with Roth, a discussion of the faction system, inspiration and influences when writing - things like quotes and music that the author listened to, and that remind her of the characters - that sort of thing. The interview's the most interesting part; I always like reading about how authors work and what their inspirations are. The rest is pretty slight.

It's really only for hardcore fans, I think.