Gone Girl by Gillian Flynn

On a warm summer morning in North Carthage, Missouri, it is Nick and Amy Dunne's fifth wedding anniversary. Presents are being wrapped and reservations are being made when Nick's clever and beautiful wife disappears from their rented McMansion on the Mississippi River. Husband-of-the-Year Nick isn't doing himself any favors with cringe-worthy daydreams about the slope and shape of his wife's head, but passages from Amy's diary reveal the alpha-girl perfectionist could have put anyone dangerously on edge. Under mounting pressure from the police and the media--as well as Amy's fiercely doting parents--the town golden boy parades an endless series of lies, deceits, and inappropriate behavior. Nick is oddly evasive, and he's definitely bitter--but is he really a killer? 
As the cops close in, every couple in town is soon wondering how well they know the one that they love. With his twin sister, Margo, at his side, Nick stands by his innocence. Trouble is, if Nick didn't do it, where is that beautiful wife? And what was in that silvery gift box hidden in the back of her bedroom closet?

For me, this book was very unpredictable - it moved so fast I didn't even really have time to guess what was going to happen, and I loved that it kept it's momentum right to the very last page.

The ending was very ambiguous (particularly the very last paragraph!) which leaves me to think 1) this might have been done deliberately to leave room for a sequel???! or 2) just goes to show that Amy's and her scheming, manipulative, overactive mind hasn't changed at all. I loved that it was left with a big question mark at the end to keep you thinking, rather than tying everything up with a neat little bow. 

I can't wait to go see the movie now to see how it plays out on screen.