Beyond back story revealed in scenes, which are dropped into a story line, there are two types of pre-story content: The Given and The Hidden.
The Given is often used as a way to gloss over really unbelievable content. If you want to write about post apocalyptic times, you don’t have to write the actual Apocalypse. You write about civilization in ruins and give hints as to what caused it. Readers have to go along with the account of the events because they see the results.
Freakangels.com does this nicely.
It doesn’t have to be apocalyptic either. Past events that needed to kick a story off are also presented in the given. Here’s a great one. ”Marley was dead: to begin with.” Dickens goes on to even explain why the Given is so important in story telling. ”This must be distinctly understood, or nothing wonderful can come of the story I am going to relate. If we were not perfectly convinced that Hamlet’s Father died before the play began, there would be nothing more remarkable in his taking a stroll at night…” And he gives us another wonderful example.
The other pre-story information is The Hidden. This happens all the type in Murder mysteries. We come in to the scene of the crime and have to follow the detective on the journey to discover what happened in the Hidden.
This is also a great device for plot twists involving characters who are shape-shifters–characters who change their allegiances during the story. To stay on the Christmas theme, I draw an example from The Ice Harvest. Toward the end of the story Renata, the fem fatale, who has been leading Charlie around, tempting him with the reward of sex, is revealed to have been in cahoots with Vic all along.
Her true intentions have been Hidden. The planning and manipulation that took place before page one or scene one, have been purposely kept from the main character and therefore the audience.
Revealing The Hidden allows the writer to turn on the tension and throw the audience off kilter just when they think they know what’s going to happen.