This isn't a book, or short story even. It's just one scene from Divergent rewritten in Four's POV. And it was a pretty decent scene that was chosen. I think most fans of Divergent are also pretty big fans of Four, so any insight into who he is and how he thinks is going to be well received. It would have been nice to learn more about him than just how much he likes Tris, but it's still a fun read. I'd definitely read more from Four's POV, he's pretty awesome.