Subplots

How to create subplots that support your main story arc

Subplots are the secret ingredient that turns a good story into a rich one. They give your world texture, your characters depth, and your readers something extra to care about along the way. A subplot is a secondary storyline that runs alongside the main plot, supporting or contrasting it to make the whole story feel more complete.

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Think of your main plot as the backbone of the story and subplots as the muscles that help it move. Without them, everything can feel flat or one-dimensional. With them, you create tension, emotional variety, and a sense that the world extends beyond the central conflict.

A well-crafted subplot can:

• Reveal a different side of your main character

• Echo or contrast your main theme

• Build relationships and emotional stakes

• Deepen your world and make it feel lived in

But subplots only work when they have purpose and structure. Let’s go step by step through how to create them effectively.

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Step 1: Identify what your story needs

Start by asking what your main story might be missing. Is it emotional contrast? Character development? A secondary conflict?

For example, if your main plot is about survival, a subplot about friendship or trust can add warmth and emotional weight. If your story focuses on revenge, a subplot about forgiveness or new beginnings can add contrast.

Your subplot should have a clear role. It might:

• Reinforce the main theme (love in the face of danger)

• Offer contrast (a quiet domestic struggle alongside a large-scale conflict)

• Humanise your protagonist (showing them outside of the main mission or conflict)

• Raise stakes indirectly (a personal relationship affected by the main plot’s events)

Avoid adding subplots just to fill space. A subplot that does not connect back to the main story will only weaken the pacing.

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Step 2: Choose the type of subplot

Subplots come in a few common types, each serving a different purpose.

1. Character subplots
These explore relationships or personal struggles. For example, a romance between two crew members on a dangerous mission, or a mentor-student bond that grows strained over time.

2. Thematic subplots
These reinforce your story’s central idea. For example, in a story about freedom, a subplot might explore another character learning to let go of control.

3. Conflict subplots
These introduce smaller challenges that mirror or contrast the main one. For example, your protagonist’s internal conflict about morality while fighting an external enemy.

4. Mystery or discovery subplots
These keep readers curious. For example, clues about a hidden past, a secret betrayal, or a mystery within a larger mission.

5. Comic or emotional relief subplots
These give readers breathing room between high-tension scenes, while still revealing character and theme.

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Step 3: Link your subplot to the main plot

Your subplot should always connect to the main storyline in some meaningful way.

Ask:

• How does this subplot affect the outcome of the main plot?

• How does it reveal or challenge the protagonist?

• Does it support the story’s tone and theme?

For example, if your main story follows Kai trying to survive the space station, a subplot could involve Kai forming a friendship with a malfunctioning AI that slowly regains fragments of its memory. The friendship could explore loneliness and trust, adding heart and tension to the main survival story.

Avoid creating subplots that feel separate or unfinished. Every subplot should start, evolve, and resolve in some way by the end.

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Step 4: Give your subplot its own arc

A subplot is a mini-story. It needs a beginning, middle, and end just like your main plot.

Beginning: introduce the subplot naturally, often through a secondary character or event that relates to the main story.
Middle: develop tension or change. The relationship or conflict should grow or shift as the main plot unfolds.
End: resolve it clearly. Either it concludes fully, or it reaches a new stage that reflects the outcome of the main story.

Example with Kai: The friendship subplot with the AI begins when Kai reboots a damaged system. The middle develops as the AI helps, hides information, and shows signs of guilt. The end resolves when the AI sacrifices its final power to save Kai, bringing emotional closure.

Quick test: if you removed the subplot, would the main story feel emptier or lose impact? If not, the subplot may not be strong enough.

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Step 5: Balance your subplots

Good stories weave subplots in carefully. Too many can confuse readers or slow the pacing.

Tips for balance:

• Limit yourself to two or three strong subplots in a standard novel.

• Make sure each subplot appears regularly enough to stay memorable.

• Do not let a subplot dominate unless it becomes part of the main plot by the end.

• Keep transitions smooth. When switching between threads, remind the reader where each stands.

Avoid dropping a subplot for 100 pages and suddenly reviving it near the end. Consistency keeps the story cohesive.

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Step 6: Interweave with purpose

Subplots work best when they naturally overlap with the main plot.

You can weave them together by:

• Using the same events to affect multiple storylines

• Letting the resolution of one subplot trigger progress in another

• Showing how choices in one area of the protagonist’s life affect another

Example: Kai’s trust in the AI subplot directly impacts how they handle the station’s main crisis. The emotional resolution of one fuels the physical resolution of the other.

Quick test: can you identify at least one moment where your subplot directly changes the main story’s direction or outcome? If not, find a place to tighten the connection.

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Step 7: Physically map your subplots

Keep track of where each subplot begins, builds, and ends.

Use your novel planner to record subplot arcs beside your main plot outline. You can also:

• Use different coloured Post-it notes for each subplot.

• Add a column to your spreadsheet called “subplot reference” to track which chapters include it.

• Write short summaries of each subplot’s key beats on index cards and lay them out alongside the main plot.

This makes it easy to see whether your subplots are evenly distributed and whether any vanish for too long.

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Step 8: Edit and refine

Once your draft is done, read through your story with each subplot in mind.

Ask:

• Does this subplot resolve or transform by the end?

• Does it deepen the main story’s emotion or theme?

• Could I merge or cut any subplots without losing meaning?

Be willing to simplify. Two strong subplots are better than five half-formed ones.

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Common pitfalls

• Unrelated subplots: they distract rather than add depth. Fix by linking them back to the theme or the main character.

• Unfinished threads: they vanish mid-story. Fix by giving every subplot at least a short conclusion.

• Overloaded middle: too many subplot scenes close together can slow pacing. Spread them out.

• Forced symbolism: not every subplot needs to “mean” something deep. It just needs to feel true to the story.

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How to know it feels right

You can describe each subplot in one clear sentence. You know when it starts, when it peaks, and when it resolves. The subplot changes or challenges your protagonist in a visible way. When you move a subplot event, it ripples through the main plot. And most importantly, when you read through your story, you never forget that subplot exists.

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Final thoughts

Subplots are not typically decoration, unless it's a Channel 5 movie! They are structure. They make your story feel full and alive, showing that your characters have lives beyond the central conflict. Each subplot should serve a purpose, change something, and connect emotionally or thematically to your main plot.

Use your planner, your Post-it notes, and your notes on influences to shape them deliberately. Keep returning to your audience notes too, to make sure the tone, pacing, and focus still fit the readers you are writing for. A well-built subplot will stay with readers long after the last page because it reflects something deeper within your story’s world and your characters.

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Summary: How to create meaningful subplots

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• Subplots add depth, emotion, and complexity to your story

• Every subplot should serve a clear purpose and connect to the main plot

• Use subplots to reveal character, reinforce themes, or create contrast

• Limit subplots to a few strong ones that appear regularly and resolve naturally

• Give each subplot a full arc with a beginning, middle, and end

• Weave subplots into the main story so that events in one affect the other

• Track subplots in your novel planner, with coloured notes or a spreadsheet

• Edit carefully to ensure each subplot resolves and adds value to the story

• Avoid unrelated or unfinished subplots that slow the pacing or confuse readers

• A great subplot feels essential, enriching the main story rather than competing with it