Gone Girl by Gillian Flynn

On the day of Amy and Nick's fifth wedding anniversary, Amy Dunne disappears from their home. Nick calls the police, insisting he had nothing to do with her going missing--but he hasn't been entirely honest with the authorities. Adding to the intrigue is the fact that he also has a disposable phone that he refuses to answer. Entries from Amy's diary for the past six years (recounting her relationship with Nick) are interspersed with Nick's account of the aftermath of Amy's vanishing. The reader learns that their marriage was under some strain after they both lost their jobs and moved from New York City to Nick's small hometown in Missouri. At first, it's obvious that we don't know what was really going on in their marriage, but slowly the reader is privy to their innermost thoughts--be prepared to descend into all the ugliness that the uniting of two people can sometimes bring. Gone Girl, while leisurely-paced in the beginning, is not a novel that one will soon forget.