A dinner party with friends — both spouses smile, cut steak, refill wine. In voiceover, both narrate their secret thoughts: she’s planning her disappearance; he’s planning to make her disappearance look like a fake disappearance. The audience doesn’t know who’s the predator until the final 20 minutes.

Here's a feature concept based on your keywords: Gone Girl 2: The Perfect Marriage

Explores the "perfect marriage" (mtrjm kaml) as a social media illusion — where both partners perform devotion publicly while secretly sabotaging each other. The twist: this time, both spouses are secretly Amy Dunne-level manipulators, each trying to frame the other for their own "disappearance."

Unlike the first film, neither wins. They are forced to stay married forever — because revealing the truth would expose both as monsters. The final shot: a wedding photo, pristine, with the word "kaml" (perfect) engraved on the frame — as one spouse smiles poison into the other’s ear. Would you like a full treatment, or a poster tagline like: "Till death do us part... or until one of us thinks of something better."