If you havent read yet then get thee to a bookshop, go!
The chilling story charts the dramatic break down of a marriage, told from both the husband and wifes perspective through flashbacks and foreboding real-time narrative. Its a rip-roaring murder mystery and the film adaptation is shaping up to be just as thrilling.
The new trailer paints Nick Dunne, played by Ben Affleck, as the villain and gives away more of the tangled plot and a very creepy looking Neil Patrick Harris is revealed as the actor who plays disappeared Amy Dunnes (Rosamund Pike) suspicious former boyfriend.
The clip also hints at the dark new ending that director David Fincher has hatched with the books author, Gillian Flynn.
Watch below.