WATCH: Extended 'Gone Girl' Movie Trailer From David Fincher With Ben Affleck, Rosamund Pike In Marriage Ending In Tragedy Thriller [VIDEO]

Gone Girl's first full trailer debuted this week, giving us more insight into director David Fincher's thriller starring Ben Affleck and Rosamund Pike. This film has a release date set for October 3, 2014, and also stars Neil Patrick Harris, Tyler Perry, Kim Dickens, Patrick Fugit, Emily Ratajkowski, Casey Wilson, Boyd Holbrook and Scoot McNairy.

The teaser trailer for Gone Girl, released earlier this year, gave us a good idea of how a town is almost convinced that Affleck's character killed his wife, or was involved in some way with her disappearance, but in this new extended look at the movie we see that there's a bit more to it than we thought. For instance, Neil Patrick Harris' character sure is mysterious and a bit creepy in this clip. What's his deal?

Though this trailer has us asking plenty of questions, what we do know for sure is that this murder-mystery looks like one of the best movies of the year.

Watch this trailer here:

Here is a synopsis of Gone Girl:

Directed by David Fincher and based upon the global bestseller by Gillian Flynn -- unearths the secrets at the heart of a modern marriage. On the occasion of his fifth wedding anniversary, Nick Dunne (Ben Affleck) reports that his beautiful wife, Amy (Rosamund Pike), has gone missing. Under pressure from the police and a growing media frenzy, Nick's portrait of a blissful union begins to crumble. Soon his lies, deceits and strange behavior have everyone asking the same dark question: Did Nick Dunne kill his wife?