Rating: 4/5 
 ***Spoiler-free*** 
 I loved the Divergent series, and I saw this book on the shelves of my library several months ago and told myself I would read it soon. I finally got around to it a few days ago. I would have given this book a higher rating, if not for the fact that I found some parts very good and some parts pretty boring. 
 I expected to love this book as much as I loved the Divergent series, but I didn't like it as much as I hoped I would. I really enjoyed the first three stories, "The Transfer," "The Initiate," and "The Son" because these took place before Four was an initiation instructor, and reading about his backstory was really great for me. I love reading where characters came from and how they're grown throughout a series. What I also appreciated was learning more about Eric, since in the main series you don't get much information about him besides that he's smart, cruel, and kinda psychotic. 
 I didn't enjoy the story "The Traitor" it ran entirely parallel to "Divergent" and while I like reading short scenes from stories told in another POV, I don't really like reading a something like 80 pages where some of it is the same scene from Divergent, just Four's POV instead. 
 The little bonus scenes at the end which were a few pages long and told from Four's POV were pretty cute. My favourite out of the 3 was "First Jumper - Tris!" 
 I did notice that some of the book seemed extremely similar to what Tris went through, especially with the way Amar treated Four compared to how Four treated Tris. I realize that Amar probably inspired Four to act like that, but the similarities were pretty noticeable to me. 
 I would recommend this book for those who have at least finished "Divergent" and wants to know more about where Four came from. I don't think reading "Insurgent" or "Allegiant" is necessary whatsoever, but I think "Divergent" is a must. 
 Overall, while I was slightly disappointed with this book not fully meeting my expectations, I still enjoyed most of it.