I listened to the audiobook version read by Xe Sands.  I didn't mind her as a narrator, but I had to listen to this book at 1.25x speed because it felt slow and the breaks were quite long.  The premise of this book is really cool and I think executed quite well.  We learn a lot about Evelyn and what in her past has made her the way she is.  I was personally annoyed by her every now and then but I understand the circumstances.  Each time I thought, "where is this story going? there's a decent amount of time left." I was hit with another issue they have to overcome.  It was slow for me a few times but it definitely was interesting.  The ending was alright, but I'm not sure how to make it better.  This isn't something I would've picked up on my own but a co-worker suggested it and I'm glad I gave it a shot.  I could see this becoming a movie.