I just finished reading Gone Girl and all I want to do right now is delve right back into it! Though the essence of the novel was predictable I absolutely LOVED the characters. The two main characters, Nick and Amy, were very well crafted and felt incredibly real to me (Nick especially. He's just so perfectly flawed, screwed up and human, I love it). 
 (view spoiler)[Upon finishing this book, the first thing that popped up in my mind was one of my favourite french movies "a la folie, pas du tout (he loves me not)" which also depicts the horror of having a relationship with a sociopathic woman. Hell hath no fury like a woman scorned. (hide spoiler)]