I'm going to be honest - even all this time after Allegiant, I wasn't sure if I was ready to re-enter the world of Divergent. I loved it, but that last book was painful. But I was curious, and somewhat masochistic when it comes to painful books. 
 Four is a collection of - you guessed it - four short stories. There is nothing new to add to what we already know about the Divergent universe to be gained from these stories, rather they are Four's perspective on things we know from him telling Tris later on in the trilogy, and one story we have already seen from Tris and now we get from Four. They present the picture of Four that became evident in his chapters in Allegiant - he is not as tough as he seems. He is vulnerable and scared, and this was a challenging view of Four to receive in Allegiant, when we all thought we knew him so well. These origin stories do give a greater understanding of who Four was and what made him that way. The most interesting and compelling parts was seeing him navigate being a Dauntless transfer and his friendship with Zeke and Shauna, which I adored. 
 As enjoyable as the venture back into the Divergent world was, I'm not sure they were really necessary. I can see how it's useful to a writer, for completeness, to put down where your other protag has come from and things that are important to the story, but was this really worth the twelve or fifteen dollars I paid for it? Did I gain much from it? Nah. I probably would have preferred to read about Uriah or Zeke or Christina, someone who I didn't know quite as well, that didn't feel like a rehash. But I've bought other books that weren't worth my money before, and at least this makes me collection complete. Not sure that it warranted two pages of acknowledgements though. Come on Veronica, wrap it up. 
 3.5 stars. I still love Four, can't help it.