: Realizing they are both "broken" in the same way, they decide to burn bridges together.

(dark and gritty, romantic and tragic, or fast-paced action)

: They find each other in a cold, unforgiving environment.

: Gritty reality (crimes, money, fast cars) vs. the purity of their loyalty.

: The title's wedding vow is repurposed as a survival oath.

: The central part of the story involves escaping "the shadows" and the people trying to pull them back.

: They are constantly in motion, fleeing from the past or the law.

To help me refine this into a specific script, short story, or video treatment: