What a great prequel! 
 I love The Maze Runner books! Now, before someone comments "but your ratings are so low", I know, I know, I know. 
 I loved The Maze Runner; the action; the characters; the mystery. The Scorch Trials I enjoyed a little less, since the pace dropped so much and well... no real answers were given near the end of the second book. As for The Death Cure... that 'HAE' sort of ending really ruined the rest of the book for me ((view spoiler)[ I mean Thomas just went like "fuck it, I'm gonna let everyone die and live my life with the other munies in this place we claim for ourselves. It just felt so... cheap idk. I understood his actions, seeing what he's all gone through but... Thomas never seemed like a guy whom would stop caring and only look out for himself, you know? (hide spoiler)]). 
 But despite all this, I enjoyed this series so much, and I consider it a favorite anyway. 
 The Fever Code Review: BIG AND SMALL SPOILERS THROUGHOUT THE REVIEW! 
 I enjoyed this prequel so much! Did I get all the answers I wanted? No, it's a James Dashner book after all and that man likes his secrets. Which is cool with me, because our MC's didn't get all the answers either. 
 But I did find out so much stuff that was still great to finally know about. In TFC we get a big look into the lives of the Gladers before they enter the maze. We see them life and grow in the WICKED headquarters, get tested (as much consiously as subconsiously), make friendships etc. I got to see Thomas and Teresa grow together and also saw them grow apart, which was rather sad. They start out as friends, grow into something you thing might grow into love, only for Teresa to betray Thomas in the end. Because, sad as it may be, Teresa believed in WICKED and stays loyal to them, while Thomas grows more and more tired of the lies, the hurt WICKED feeds him. 
 The story starts with Thomas being taken to WICKED and ends with him deciding he wants to enter the maze. BUT not because of the cure, or because WICKED asked him too... no. Thomas decides to go into the maze to save his friends. Thomas watches the Gladers when they're in the maze, sees their despair, their pain, and at some point he decides that it's enough. 
 'WICKED was never going to stop. 
 They were never, never going to stop.' 
 He won't put his friends through this any longer. And in order to save them, he plans to enter the Maze, convincing dr. Paige that he and Teresa need to go in with their memories intact. But Teresa and Paige betray him, by actually taking his memories from him anyway. 
 And the story ends with Thomas waking up in the Box. 
 So... what does all this mean? Well: 
 1) Thomas became aware that WICKED was in fact not all 'good'. And he planned to get his friends out of the maze! Despite that Thomas firsts believes helping WICKED was the right thing, he did realize that it wasn't. He wasn't a 'bad guy' in the end, which Thomas feared for in TMR books. 
 2) It is shown in the end that Teresa (and Aris) didn't get their memories wiped, and therefor were fully aware of what WICKED was and what horrible things were planned for Thomas and the Gladers throughout TMR books. 
 3) You find out in TFC what the Purge is. (meh) 
 4) Ava Paige is a horrible, lying, mischevious person: 
 '"It was me, Thomas. I know you won't remember this, but I want to say the words to you anyway. Explain myself. It was me who infected Chencellor Anderson and his senior staff. They wanted to end things after the Maze Trials. They wanted to give up. And I could never allow that, could I? What we're trying to achieve is much too important."' 
 NOW on a side note: Newt. My baby. My favorite character... with his 'bloody this and bloody that', his longish hair, his everything... I cried so much for you in this book. 
 The epilogue is from Newts past, revealing he has a sister named Lizzy-renamed Sonya(!!? I freaked out a little at this). 
 I loved that little reveal, and seeing Newt and his sister say goodbye before he is sent into the maze.. it's so sweet and sad. 
 But the part in this book that broke my heart was seeing Newt attempt his suicide. We read how Thomas sees it in an observation room and guys... It's so sad! :( My poor baby. 
 'Those groans turned into sobs. A deep, painful cry that made Thomas's chest hurt. 
 Newt suddenly let out an anguished howl, then screamed into the air. "I hate you. I hate you!"' 
 For me, some unresolved stuff was explained... and some wasn't. But I enjoyed learning some secrets and revelations and for me, this book was a great addition in TMRseries. And a great conclusion of some sorts too! 
 I recommend reading this series in publication order; because the suspense is great in that order!