Watch the Most Harrowing Gone Girl Trailer Yet

Things take an even darker turn.

For anyone that dove into Gillian Flynn's thrilling novel Gone Girl with nary a bathroom break, each new bit unveiled from David Fincher's forthcoming film adaption, starring Ben Affleck and Rosamund Pike, mounts the tension.

The third trailer has been unveiled, and as you might've predicted from watching the previous two, things take an even darker turn for Affleck's character, Nick. Like the others, we're first introduced to the couple's starry-eyed beginnings, but learn swiftly that their marriage wasn't all rainbows and butterflies.

The part that will send chills down your spine? When Pike's character Amy declare she's afraid her husband might try and kill her. Oh, but don't lowball the creepiness factor of Neil Patrick Harris' surprise appearance as Amy's ex-boyfriend, Desi Collings, who's "just trying to help."

Watch the trailer, below, and try your best to cool your heels before the film hits theaters on October 3.

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