Kept me guessing.   I had theory after theory about this book, and I was right in a few of them, but not all.  I like the unreliable narrator and how we were never quite certain if she knew what was going on and who she even was at times.  Blurring the line between reality and hallucinations or imagination was a good technique for keeping me guessing and on my toes.  I like Alex and how she tells this story and I thought the characters surrounding her were really well done.  I recommend this for anyone who likes that kind of thriller.