Much easier of a read the 2nd time around and I'm glad I finished it this time! The last 1/3 of the book is the good part, but you have to push through to get there.
I must have the extra special edition, as mine came with a Top Secret file following the epilogue that I found to actually be key in connecting the dots. I feel as though Dashner hoped his readers would make an automatic connection between DeeDee and Teresa, but many did not. I know I didn't. The last sentence blew my mind and is the reason for the 3 stars. Knowing this is Teresa's origin story would ruin the surprise but certainly help readers feel more connected to this story's characters.
All in all, I think it has proved this series still garners enough interest from me that I can go read The Fever Code.