A plot synopsis won’t do this movie justice, but here it is anyways.
Nick Dunne (Ben Affleck) spends the morning of his fifth wedding anniversary alone on a beach before heading to a bar he co-owns with his sister Margo (Carrie Coon). It’s clear the siblings are over Nick’s wife Amy (Rosamund Pike), the titular gone girl who turns out to be missing after Nick returns home to find a crime scene.
An investigation begins, the community rallies around the family, and Nick can’t keep himself from looking like the guilty party with blunder after stupid blunder. When the national media turns circus, Nick does what he can to maintain his innocence, but he’s in over his head.