What Is a Subplot?
Quick answer: What is a subplot? A secondary storyline running beside the main plot, with its own arc, that deepens theme, character or stakes. Definition and examples.
A subplot is a secondary storyline that runs alongside the main plot, with its own beginning, complication and resolution, but less page time and lower stakes. It usually follows a supporting character or a different strand of the protagonist's life, the romance beside the investigation, the failing marriage beneath the court case. A true subplot is not padding; it earns its space by touching the main plot, echoing the theme, or changing what the climax costs.
Understanding subplots matters in both directions. Novelists need them to give a long book texture, rhythm and a second angle on the theme. Short story writers need to know why they almost never fit under 5,000 words, and what to do with the instinct to add one anyway.
The longer answer: what subplots are for
Subplots do four jobs, and a good one usually does at least two. They develop character by showing the protagonist in a second arena; a detective at her mother's bedside is a different instrument than a detective in an interrogation room. They control pacing, giving readers relief from the main tension and giving the writer somewhere to cut away at a cliffhanger. They raise stakes by wiring lives together, so the climax endangers more than the case. And they carry theme by variation, testing the story's central question on different people.
The thematic job is the most distinguished. Shakespeare built King Lear with a full parallel plot: Gloucester misjudges his sons as Lear misjudges his daughters, and the echo turns one family's error into a statement about blindness itself. That is the classic test of a subplot worth keeping: it should be the theme played in another key, not merely more events in the same world.
Subplots you can study in named books
Jane Austen's Pride and Prejudice runs its main plot on Elizabeth and Darcy while braiding subplots around Jane and Bingley, Lydia and Wickham, and Charlotte and Mr Collins. Each is a different answer to the novel's question of what marriage is for: affection, appetite, security. Lydia's subplot does double duty, embodying the theme while detonating inside the main plot, since her elopement forces Darcy's decisive intervention.
In genre fiction, the Harry Potter books run house rivalries, friendships and school mysteries beneath each year's central danger, and the series' most quoted emotional payoffs come from those secondary strands. Crime novels almost always give the detective a private subplot, the custody battle, the sobriety struggle, because the genre learned that a case alone cannot carry feeling. Watch in each example how the subplot intersects the finale; strands that never reconnect are the mark of a draft, not a design.
How to build one, and when to refuse
Design a subplot as a miniature plot: someone wants something, something resists, the outcome changes them. Give it three to six beats spread through the book, entering after the main plot is established and resolving just before or during the climax, ideally altering the climax's cost or outcome. Wire at least one hard connection: a shared character, a consequence that crosses strands, a decision in one plot forced by events in the other.
Refuse subplots in short fiction. Under about 5,000 words there is room for one plot and one echo, a secondary character whose situation rhymes with the protagonist's for a scene, which gives the effect of depth without the cost of an arc. Writers drafting for Writory's Short Story Contest, capped at 2,000 words, do better converting the would-be subplot into a single resonant detail; blind judges scoring structure consistently reward one clean arc over two cramped ones.
Common subplot failures
Most subplot problems are proportion problems, and they announce themselves in reader behaviour: skimming one strand to get back to another.
What poets can take from this
- Give every subplot its own want, obstacle and change, in miniature.
- Wire at least one hard connection between strands: shared consequence, forced decision.
- Let the subplot resolve just before the climax and change what the climax costs.
- If a subplot outshines the main plot, consider promoting it rather than trimming it.
- In stories under 5,000 words, replace subplots with a single rhyming detail.
Try it yourself
Outline a main plot in five beats about a nurse hiding a mistake. Then design a subplot in three beats for her teenage son, built on the same theme of confession, and mark the exact scene where his strand forces her hand. Write that intersection scene in 800 words.
Questions
How many subplots should a novel have?
Most novels carry one to three; epics carry more by running full parallel plots. The limit is not count but attention: every strand must be missed when absent. If readers skim any strand to return to another, you have one too many.
What is the difference between a subplot and a B-story?
Screenwriting uses B-story for the secondary strand, often the relationship plot, that carries the theme while the A-story carries the action. It is a subplot with a specific job. Prose borrows the term loosely; the concepts overlap almost completely.
Can a short story have a subplot?
Rarely under 5,000 words, and almost never under 2,000. Short fiction achieves depth through resonance instead: a secondary character whose situation rhymes with the main one for a scene. Save true subplots, with their own arcs, for the novelette and up.
By the Writory editorial team, reviewed by working poets. Updated July 2026.
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