"Gone Girl," the highly anticipated mystery thriller film starring Ben Affleck, previewed its trailer at CinemaCon 2014 in Las Vegas on Thursday. Based on Gillian Flynn's 2012 book of the same name, the movie has a release date of October 3, 2014. David Finch (Facebook) directs the film, with novelist Gillian Flynn penning the screenplay. The film also stars Rosamund Pike, Neil Patrick Harris and Paul Mills.

"Gone Girl" is about a man named Nick Dunne (Ben Affleck) who is suspected of murdering his wife, Amy (Rosamund Pike), after her disappearance. In the trailer, according to the LA Times, which is set to a Richard Butler cover of "She," there are scenes of the couple together as well as scenes of Nick dealing with the aftermath of Amy's disappearance. When Dunne is not dealing with the media or the police, he is recalls memories of his wife lying in the bath or lounging in bed. There is almost no dialogue in the trailer, aside for Nick's line at the end of the teaser: "I did not kill my wife. I am not a murderer."

Gillian Flynn recently spoke with Entertainment Weekly writing the screenplay adaptation to her best-selling novel. "There was something thrilling about taking this piece of work that I'd spent about two years painstakingly putting together with all its eight million Lego pieces and take a hammer to it and bash it apart and reassemble it into a movie," Flynn said. She also reveals that readers who were dissatisfied with the book's ending may prefer the movie's conclusion, hinting that the two are different. "Ben was so shocked by it," Flynn said. "He would say, 'This is a whole new third act! She literally threw that third act out and started from scratch.'"

Are you excited about the Gone Girl movie? How do you think the movie ending will differ from the book?