The movie centers on character Nick Dunne (Affleck), who is suspected of killing his wife Amy (Pike) after she goes missing. The dramatic trailer ups the chill factor with a voiceover from Amy's journal, and features the first look at Neil Patrick Narris as her obsessive ex, Desi.
"I finally realized I am frightened of my own husband," Amy writes. "Man of my dreams, this man of mine may kill me."
Gone Girl opens in theaters October 3.