This books is a huge four pages long, so not a huge amount to say here about plot etc. And anything I could say is already described in the title anyway. 
 I love that Dashner has taken the time to create something to keep his Maze Runner fans hungry though. It makes me instantly want to reread the series (even more so as I have just discovered that another prequel, The Fever Code, is coming out next September. Eek!) and also provides an added insight into how the character's lives might have looked pre-maze.