I don't know if it was because I read this after I had finished the entire series and I craved more, or because this book felt like the perfect extension of the Newsflesh series. But this novella was definitely my favorite of all of her novellas. 
 (As in all of her books) the characters and development of them is incredible. You are following one of the secondary characters that was important throughout the first three books and if you haven't read the first three books this book contains serious spoilers. So take my warning and go read the others first. 
 I guess a lot of people didn't enjoy this one, but I couldn't get enough. Go read it and make your own opinion!