"Gone Girl" is written from the joint persecutive of the two main characters, who seem to share the roles of both protagonist and antagonist, depending on the point of view and the disposition of the reader. And the reader's feelings toward Nick and Amy Dunne definitely flit about, almost as quickly as the shifting viewpoints. What does remain steady throughout this very tightly drawn narrative, is the inkling that something is terribly wrong with these people, and things cannot end well. The "gone" part of "Gone Girl" implies more than just a literal disappearance; it reflects, too, the mental instability of one of the characters as well as the dissolving layers of this young couple's relationship.
If you are looking for something different, something dark and slightly askew, but thoroughly engrossing, give "Gone Girl" a go!