The Kill Order answered all of the remaining questions I had from the previous books in the series. Yay! I felt like it took forever to get some answers. The Kill Order wasn't the most exciting read but it brought some needed clarity.
If you decide to read The Maze Runner series wait to read the prequel until the end-- if you read it first it may ruin the rest of the series.
* As of right now I have read 14 books this year.