The White Room plot:

Character A and Character B are either lovers or incredibly close friends when Character A passes away. It’s incredibly hard for Character B but they continue living. Years later, Character B gets in a terrible accident. They wake up in a strange white room that seems endless with two doors and two chairs. In one of the chairs is Character A, who tells Character B that they are in purgatory (limbo) and that one door leads to the after life and the other leads back to Earth. Character B has to decide which door to take; Door 1, that leads them to the great beyond where they can be with Character A again, or Door 2, where they can go on with living.

Additional Option #1: To add to the stakes, the addition can be made of a window in the room that allows Character A and Character B to view what is going on back on Earth with Character B's body. Such as the trip to the hospital and people coming to see them.

Additional Option #2: Another way to add a layer of angst is to have it be that if Character B chooses Door 2, they’ll forget their time together with Character A in purgatory.