Gone Girl by Gillian Flynn
Gillian Flynn’s latest novel of psychological suspense will confound anyone trying to keep up with her quicksilver mind and diabolical rules of play. Not that there’s anything underhanded about her intentions: she promises to deliver an account of the troubled marriage of Nick and Amy Dunne, who alternate as narrators, and so she does. The trickery is in the devilish way she tells their story. New York Times, Marilyn Stasio 
This is one of my favorite books that I've read this year. It is a roller coaster of a ride. I didn't want to spoil the book with too much information. I would recommend not reading too many reviews, even the inside cover will spoil some of the twists and turns.