People often use "arc" loosely to mean "what happens", but an arc specifically tracks change: a difference between how something starts and how it ends, shaped by pressure along the way. Understanding which arcs you are building, and how they interact, makes a book’s progression far easier to plan and to judge once drafted.
This guide sets out the main kinds of arc, how to sketch one before or during drafting, and how they connect to the wider plot; see [How Do I Plot a Novel?](/resources/writing-craft/how-do-i-plot-a-novel) for how arcs translate into a working sequence of scenes.
What is a story arc, exactly?
A story arc is the path something takes from one state to a meaningfully different one, under pressure from conflict or events in between. "Meaningfully different" is doing the work here: a character who simply survives a string of events without changing, learning or losing anything has been through incidents, not an arc.
What kinds of arc exist?
| Arc | What changes | Typical use |
|---|---|---|
| Plot arc | The external situation or problem | Drives the main "what happens" of the book |
| Character arc | A belief, flaw or capability the protagonist holds | Gives events emotional weight |
| Emotional arc | How a character or reader feels moment to moment | Shapes pacing and tone |
| Relationship arc | The dynamic between two characters | Common in romance, family stories, ensembles |
| Mystery arc | What is known versus concealed | Drives curiosity in crime and thriller fiction |
| Series arc | A larger change spanning multiple books | Threads a long-running story across instalments |
Most novels run at least two of these simultaneously, usually a plot arc paired with a character or relationship arc.
How do I define the beginning state?
Describe, briefly, the situation or belief the arc starts from: what a character wants, believes or has, and what is stable about their world before the story disturbs it. This does not need pages of backstory; a sentence or two is usually enough to work from.
Example
For example: "Mara believes asking for help is a weakness, and has built a life that avoids ever needing to." That single belief gives an arc something concrete to challenge later.
How does escalation build an arc?
Escalation means the pressure on the beginning state increases rather than repeats. Each significant event should make the original situation, belief or relationship harder to sustain than it was before, until it can no longer hold in its original form.
What are turning points, and how many do I need?
A turning point is a moment that changes the direction or stakes of the arc, usually because a character learns something, loses something, or makes a decision they cannot undo. There is no fixed number; most novels have somewhere between two and five significant ones, spaced through the book rather than clustered.
How does the climax connect to the arc?
The climax is where the pressure built through escalation forces the change the arc has been moving towards, whether that is a confrontation, a decision or a realisation. It should draw on earlier turning points rather than introduce an unrelated final test.
How do I define the changed state?
Describe what is now different from the beginning state: what the character believes, has, or is capable of that they were not at the start. This does not have to be a triumphant change; a character can end diminished, wiser, or having lost something meaningful and the arc still be complete.
Example
Continuing the earlier example: by the end, Mara might still find asking for help difficult, but she has done it once, at real cost, which is enough to register as change without resolving the flaw entirely.
What is a flat arc, and when does it work?
In a flat arc, the protagonist’s core belief stays largely stable while they use it to change the people or situation around them, rather than being changed themselves. This suits steady, principled protagonists in series fiction or stories about resisting pressure to change. It only works if the surrounding world visibly shifts because of them; otherwise the book can feel static.
How do series arcs work across books?
A series arc spans multiple books, with each instalment resolving its own smaller arc while contributing to a larger, slower change across the series, such as a character’s gradual transformation or an unfolding world-level situation. Each book still needs its own complete arc so it does not feel like an unfinished fragment on its own.
Common mistakes
- Confusing events with an arc. A character can survive a full plot’s worth of incidents and still end exactly where they began, emotionally and morally. That is a sequence, not an arc.
- Changing a character too quickly. An arc resolved in one scene, without escalation, tends to feel unearned even if the change itself makes sense.
- Running too many arcs without a clear lead one. Several competing arcs can dilute a book’s focus if none of them is clearly primary.
- Forgetting the changed state needs to be visible. If nothing in the final chapters shows the character behaving or believing differently, the arc has not actually landed for the reader.
Frequently asked questions
Does every character need their own arc?
No. Secondary characters can remain static while still being useful and well written; arcs matter most for protagonists and major characters whose change drives the story.
Can a story have a plot arc without a character arc?
Yes, particularly in some thrillers and procedural fiction, though pairing a plot arc with even a modest character shift usually deepens reader investment.
How do I know if my arc is too subtle?
If beta readers cannot describe what changed for the protagonist by the end, the arc likely needs a clearer beginning state or a more visible final scene.
Is a character arc the same as a redemption arc?
No. A redemption arc is one specific type of character arc, moving from wrongdoing towards amends; character arcs can move in many other directions too.