I will steal a comment I once read. Gillian Flynn must love writing about horrible people doing horrible things. That is the best description of her books. 
 I liked this book. A lot. A lot more than Gone Girl which I still have unsure feelings for. 
 However, the first night I read it, I got 20 pages in. I had nightmares all night. It's haunting. That is the description. Haunting. Her writing sticks in your head. Sucks you in to her worlds. Inserts you smack in the middle of what's going on. 
 I dreamed of home invasions and nasty murders. 
 I had to stop everything I was doing and attack this book with such viciousness. I had to finish it the next day. I had to know what happened to Baby Day's family. Libby, while not a normal loveably character, made you feel such pity for the way she grew up. I found myself rooting for her, hoping that whatever bad was going to happen (bc you knew that she wasn't going to just have an easy time of it) she would make it through. 
 I found myself looking forward to finding out what happened that night. I'm not normally a murder mystery kind of person (for the above stated reason of nightmares) but with Flynn now being 2/2 on giving me such a wonderful story, I see myself reading the rest of her books as well.