Backstory

Definition

Backstory is the invisible reserve that makes present decisions legible: a gesture, a silence, a refusal. Practical rule: the author must know 100%, the reader sees roughly 20%, dosed in only when it lights a current scene — never in bulk and never "for color".

What it's for

A solid backstory gives density to present choices: you feel weight behind every hesitation. It's done backstage (codex, character files, unpublished letters), then revealed by friction — when something in the present reopens the wound.

Variants by genre

Romance: the original wound that blocks loving — revealed in fragments, often around the Third-act breakup.
Crime: an element that justifies the motive, revealed at the end (and which must be retrofittably plantable).
Fantasy: link to the prophecy or to the world's past — meter it carefully to avoid Infodumping.
SF: technological backstory (who built this AI, this ship, this protocol) baked into the universe, not just the character.
Literary: the backstory is sometimes the subject (The Lover, Beloved), handled spirally.
Nordic / regional crime: territory backstory — climate, administration, collective trauma (Indriðason).
Multi-generational saga: backstory as transmitted inheritance (One Hundred Years of Solitude, Pachinko).

Common pitfalls

Dumping it all into a Chapter-2 flashback: you kill the book's momentum before it starts.
Backstory more interesting than the actual story: a sign you should have started earlier.
Backstory with no present impact on the character's choices: psychological filler.
"Trauma copy-paste": stacking wounds like badges, none of which modifies a visible decision.
Backstory reveal as deus ex machina: justifying a twist only by a past that was never planted.

Examples

Severance (Apple TV+) — the characters' backstory is the very stake of the plot, doled out scene by scene.
The Lord of the Rings — the Ring's history is set in one scene (Bilbo + Gandalf) then recalled only when needed.
Mystic River (Lehane) — the three friends' backstory is the oxygen of the entire novel, never summarized.
Beloved (Toni Morrison) — the slavery backstory surfaces in flashes, never in bulk.
Le Quatrième Mur (Sorj Chalandon) — the narrator's political backstory explains his present madness.
Encanto (Disney) — generational backstory revealed by Abuela's song, just before the climax.
Pachinko (Min Jin Lee) — family backstory is the story, across four generations.
True Detective season 1 — Rust's backstory is revealed in interrogation fragments, never off-scene.

Writing tips

The 20/80 rule: know 100% of the backstory backstage, show the reader only about 20%, only when a present scene demands it.
No flashback longer than two pages in the first draft: force yourself to compress it into an object, a line, or a recurring image. You'll reinstate the long version only if it lights a turning point.
Every reveal must change a present decision: if the past-fact doesn't alter the current scene or the next, cut it or move it.
Plant before you harvest: any key backstory must appear in fragments (mention, reaction, object) at least 30 pages before its full reveal — otherwise it lands as deus ex machina.

Go deeper: Build a character from the inside.

Revision checklist

For each backstory reveal: which present scene is it lighting up?
Do you have a flashback longer than two pages? Could it be replaced by an object, a line, or a silence?
Can the reader guess part of the backstory before it is stated?
If you delete the revealed backstory, is the present decision still readable (in which case you showed too much)?