Subplots: How to Weave Them Into a Novel

Subplots are the secondary storylines that run alongside a novel's main plot, adding depth, texture, and complication to the central story. A well-woven subplot makes a book feel richer and more alive; a poorly handled one dilutes the main story or, worse, trails off and goes nowhere. The craft is not in inventing subplots but in weaving them, threading a secondary line through the primary one so the two strengthen each other rather than compete. This guide covers what a subplot is, the main types, how to weave one so it serves the main plot, and the mistakes that leave a subplot feeling like filler.

Quick answer

A subplot is a secondary storyline that runs parallel to the main plot and intersects it. To weave one well: give it its own small arc with a beginning, middle, and end; tie it to the main plot so the two affect each other; and make sure it earns its place by testing whether the story would be weaker without it. The most common subplots are romantic, character-led, and secondary-quest threads. The cardinal rule is that a subplot must serve the main story. A subplot that runs alongside the main plot without ever touching it is not a subplot; it is a separate story competing for the reader's attention.


What Is a Subplot?

A subplot is a secondary storyline that runs alongside the main plot of a novel. Writers and editors often borrow the screenwriting shorthand of the A-plot, B-plot, and C-plot: the A-plot is the central story, and the B and C plots are subplots that run parallel to it and, crucially, come back to serve it. A novel can carry one subplot or several, depending on its length and complexity. There is no fixed number. The right count is however many the story can support without tangling.


What separates a subplot from a digression is connection. A true subplot intersects the main plot, affecting it and being affected by it. The events of the subplot change what happens in the main story, and the main story shapes the subplot in return. A storyline that runs alongside the main plot but never touches it is not a subplot; it is a second story competing for space, and it will feel like a distraction no matter how well written.


Subplots earn their place by doing work the main plot cannot do alone. They develop secondary characters, deepen the theme, raise the emotional stakes, vary the pace, and complicate the protagonist's path. A subplot can give the reader a breather from the main tension, then feed back into it with new force. The test of any subplot is simple: if you removed it, would the story be weaker? If the answer is no, the subplot is filler, however enjoyable it is to write.


The Main Types of Subplot

Subplots come in recognizable forms. Knowing the common types helps you see what a given subplot is doing and how to make it pull its weight.


The romantic subplot

The most common subplot is a romance running beneath a main plot of another kind. A detective falls for a witness while solving the case; two members of a quest party grow close as they travel. The romantic subplot raises the emotional stakes and gives the reader a second outcome to care about. It is so common in fantasy and adventure fiction that some genres expect it. When a whole book is built around the love story, you are no longer writing a subplot but a romance novel, where the relationship is the main plot and carries its own structural conventions.


The character-led subplot

A character-led subplot follows a secondary character's own arc: a sidekick's struggle, a mentor's hidden past, a rival's parallel ambition. These subplots give the supporting cast lives of their own rather than letting them exist only to serve the protagonist. The best character-led subplots reveal something that feeds back into the main plot, a secret that changes the protagonist's situation, a choice that shifts the central conflict. They reward the reader's attention by mattering, not just by adding texture.


The secondary-quest subplot

Common in fantasy, science fiction, and adventure, the secondary-quest subplot gives a character a smaller goal to pursue alongside the main objective. A side mission, a personal vendetta, a smaller mystery within the larger one. The secondary quest varies the pace and lets the writer explore corners of the world the main plot does not reach. It works best when its resolution affects the main quest, supplying a tool, an ally, or a piece of knowledge the protagonist needs for the central conflict.


The thematic subplot

A thematic subplot exists mainly to deepen the book's central idea by showing it from another angle. If the main plot concerns a character learning to forgive, a subplot might follow a second character who cannot, throwing the protagonist's arc into relief. Thematic subplots are the subtlest type, and they fail most easily, because a subplot that serves only the theme and not the plot can feel inert. The strongest thematic subplots also carry their own events and stakes, so they work as story and as meaning at once.


How to Weave a Subplot Into Your Novel

Weaving is the operative word. A subplot is not a block of story inserted between chapters of the main plot; it is a thread braided through the whole book. The process has five steps.


  1. Give the subplot its own arc. A subplot is a small story, so it needs the shape of one: a beginning that sets it up, a middle that develops it, and an end that resolves it. A subplot that is introduced and then forgotten leaves the reader with a loose thread. Before you weave it in, know where the subplot starts, what changes through it, and how it ends, even if the arc is small.
  2. Tie it to the main plot. The subplot must intersect the central story, not just run beside it. Find the points where the subplot affects the main plot and where the main plot affects the subplot. A romantic subplot might complicate the protagonist's central mission; the mission might strain the romance. These intersections are what make the two storylines feel like one book rather than two.
  3. Stagger the beats so the threads alternate. Weaving means the subplot advances when the main plot pauses, and pauses when the main plot surges. A subplot beat dropped in after a main-plot high point gives the reader a breather; a subplot beat that raises its own tension can sustain momentum while the main plot regroups. Plan where the threads cross so neither goes silent for so long that the reader forgets it.
  4. Keep the subplot subordinate. A subplot supports the main plot; it does not compete with it. If a subplot grows so large or so compelling that it overshadows the central story, you have a structural problem: either the subplot wants to be the main plot, or it needs trimming. The main story should always carry the most weight, the most stakes, and the most pages. The subplot enriches; it does not take over.
  5. Pay off every thread you plant. Every subplot you open creates a promise to the reader that it will go somewhere. A subplot raised and then dropped is one of the most common and most resented structural faults in fiction. Before a draft is finished, account for every subplot: does each one resolve, and does its resolution connect back to the main story? A thread left dangling tells the reader their attention was wasted.

Subplots and the Larger Structure

Subplots are a structural concern, which means they are easiest to manage when you plan where they fall. If you outline, you can map each subplot's beats alongside the main plot's beats and see where the threads cross. Our guide on how to outline a novel covers methods that make subplot planning visible, including the scene-card approach, which lets you lay out the threads and see how they interleave.


Subplots also interact with the other tools of plot mechanics. A subplot can carry its own plot twist, a smaller reversal that echoes or complicates the main one. It can plant its own foreshadowing toward a secondary payoff. And cutting away to a subplot at a moment of tension is one of the oldest ways to build a cliffhanger, letting you leave the main thread hanging while you advance another. A subplot is not a self-contained box. It is a thread that touches every other part of the book.


Common Subplot Mistakes

Most subplot problems fall into a few patterns. Knowing them helps you tell a subplot that enriches from one that drags.


  • The subplot that goes nowhere. A subplot is introduced with promise and then quietly abandoned, leaving a thread that never resolves. This is the most common subplot fault, and it usually happens when a writer loses track of a thread across a long draft. The fix is to account for every subplot before finishing and to resolve or cut each one.
  • The disconnected subplot. The subplot runs alongside the main plot but never touches it, so it reads as a separate story competing for attention. The fix is to build intersections: find where the subplot can affect the main plot and where the main plot can affect the subplot.
  • The subplot that takes over. A subplot grows so large or so compelling that it overshadows the main story, unbalancing the book. The fix is either to trim the subplot back to a supporting role or to recognize that it wants to be the main plot and restructure accordingly.
  • Too many subplots. The book carries so many secondary threads that none gets the room it needs and the reader loses track. The fix is to combine, simplify, or cut: ask whether two subplots can merge, and whether each surviving one earns its place.
  • The filler subplot. The subplot adds pages and incident but does no real work; the story would be no weaker without it. The fix is the removal test: if cutting the subplot does not weaken the book, cut it, and give the space back to threads that matter.

Why Subplots Are Hard to Judge Alone

Subplots are among the hardest things to assess in your own manuscript, because the problems are structural and spread across the whole book. A dropped thread is invisible from inside the draft: you know how the subplot was meant to resolve, so you may not notice that the resolution never made it onto the page. You cannot easily feel whether a subplot is pulling its weight or dragging, whether it connects to the main plot or merely runs beside it, or whether you have one subplot too many. These are exactly the judgments a developmental edit is built to provide.


A developmental editor reads the whole book the way a reader does and tracks every thread, catching the subplot that was set up and never paid off, the one that never connects, and the one that has grown out of proportion. At Editor World, you choose your own fiction editor by genre experience and verified client ratings, and you can message any editor before submitting to discuss how your subplots are working. Every manuscript is edited entirely by a qualified native English editor; no AI tools are used at any stage. For full structural feedback on a complete draft, including how your subplots weave through the main story, developmental editing is the right service, and our novel editing services cover the broader work of preparing a manuscript for submission. You can request a free sample edit of your first 300 words before committing.


Frequently Asked Questions

What is a subplot in a novel?

A subplot is a secondary storyline that runs alongside the main plot of a novel. Writers and editors often borrow the screenwriting shorthand of A-plot, B-plot, and C-plot, where the A-plot is the central story and the B and C plots are subplots that run parallel to it and come back to serve it. What separates a subplot from a digression is connection: a true subplot intersects the main plot, affecting it and being affected by it. A storyline that runs alongside the main plot but never touches it is not a subplot but a second story competing for the reader's attention. Subplots earn their place by doing work the main plot cannot do alone, such as developing secondary characters, deepening the theme, or raising the emotional stakes.


How do you weave a subplot into a story?

Weaving a subplot takes five steps. First, give the subplot its own arc, with a beginning that sets it up, a middle that develops it, and an end that resolves it. Second, tie it to the main plot by finding the points where the subplot affects the central story and where the central story affects the subplot. Third, stagger the beats so the subplot advances when the main plot pauses and pauses when the main plot surges, which lets the threads alternate. Fourth, keep the subplot subordinate, so it supports the main plot rather than competing with it. Fifth, pay off every thread you plant, since a subplot raised and then dropped is one of the most resented faults in fiction. Weaving means braiding the subplot through the whole book rather than inserting it as a block between chapters.


What are the main types of subplot?

There are four common types. The romantic subplot runs a love story beneath a main plot of another kind, raising the emotional stakes and giving the reader a second outcome to care about. The character-led subplot follows a secondary character's own arc, such as a sidekick's struggle or a mentor's hidden past, giving the supporting cast lives of their own. The secondary-quest subplot, common in fantasy and adventure, gives a character a smaller goal alongside the main objective, which varies the pace and explores corners of the world the main plot does not reach. The thematic subplot deepens the book's central idea by showing it from another angle. The strongest subplots of every type also affect the main plot rather than running beside it untouched.


How many subplots should a novel have?

There is no fixed number. A novel can carry one subplot or several, depending on its length and complexity. The right count is however many the story can support without tangling. A short, fast novel may need only one subplot or none, while a long, multi-viewpoint novel may weave several. The danger is having so many subplots that none gets the room it needs and the reader loses track. If a book feels overcrowded with secondary threads, the fix is to combine, simplify, or cut: ask whether two subplots can merge into one, and whether each surviving subplot earns its place by doing work the main plot cannot do alone.


What is the difference between a plot and a subplot?

The main plot is the central story of a novel, carrying the most stakes, the most weight, and the most pages. A subplot is a secondary storyline that runs alongside the main plot and supports it. The main plot drives the book and usually resolves at the climax, while a subplot has a smaller arc that intersects the main story and enriches it. The key relationship is subordination: a subplot serves the main plot rather than competing with it. If a subplot grows so large that it overshadows the central story, the book is unbalanced, and either the subplot needs trimming or it wants to be the main plot, which calls for restructuring.


How do you know if a subplot is working?

The simplest test is removal: if you took the subplot out, would the story be weaker? If the answer is no, the subplot is filler, however enjoyable it was to write, and the space is better given to threads that matter. A working subplot does real work, developing a character, deepening the theme, raising the stakes, or complicating the protagonist's path, and it intersects the main plot rather than running beside it. It also has a complete arc that resolves rather than trailing off. A subplot that connects to the central story, pulls its weight, and pays off its setup is working. One that runs parallel without touching the main plot, or that is introduced and forgotten, is not.


What is a B-plot?

A B-plot is a subplot, in the screenwriting shorthand that labels the central story the A-plot and the secondary storylines the B-plot and C-plot. The terms have carried over into fiction. The B and C plots run parallel to the A-plot but must come back to serve it, intersecting the main story rather than running independently. A romantic subplot beneath a murder mystery is a classic B-plot: the investigation is the A-plot, the developing relationship is the B-plot, and the two affect each other across the book. Using this shorthand helps a writer keep track of which thread is the main story and which threads support it, which is useful when weaving several storylines through a long novel.


Why do subplots get dropped or forgotten?

Subplots get dropped because they are structural threads spread across a whole book, and a thread is easy to lose track of over the months it takes to draft a novel. A writer introduces a subplot with promise, then becomes absorbed in the main plot and never returns to resolve it. The problem is hard to catch from inside the draft, because the writer knows how the subplot was meant to end and may not notice that the resolution never reached the page. This is why accounting for every subplot before finishing a draft matters, and why a developmental editor, who tracks every thread as a reader does, is well placed to catch a setup that was never paid off.

Reviewed by an Editor World fiction editor with an MFA in Creative Writing. Editor World, founded in 2010 by Patti Fisher, PhD, graduate of The Ohio State University, provides professional human-only editing for novelists, authors, and writers worldwide. BBB A+ accredited since 2010 with 5.0/5 Google and Facebook Reviews. More than 100 million words edited for over 8,000 clients in 65+ countries. Multiple Gold and Bronze Stevie Award winner. Native English editors from the United States, the United Kingdom, and Canada. Less than 5% of applicants are accepted to the editor panel. Recommended by the Boston University Economics Department, University of San Diego, University of Michigan, UCLA, University of Missouri, and more. No AI tools are used at any stage.