Through Lines: Your Book’s Special Sauce Part 2 Fiction

In my last post, I discussed through lines for nonfiction. Today, I’ll attempt to cover through lines for fiction.

Allow me to repeat part of the last post:

How many of you remember McDonald’s “special sauce” advertising for the Big Mac? I was around when they first used it in 1974. (After all these years, I wonder if the recipe is even still the same.)

So what’s special sauce got to do with writing? It’s my way of creating an analogy to this month’s topic: through lines.

The through line for your book (fiction or nonfiction) is its special sauce. In nonfiction, it’s the core idea or promise you make to your reader (and reiterate in every chapter). In fiction, it’s that invisible thread that holds the premise, plot, and character arc together.

Another way to think of through lines is like GPS. I’m forever taking other roads than what it recommends, and what do I get? Recalculating. (One of these days it’s going to respond with “Forget you. Find your own way.”) Your through line keeps you on the right route.

As stated above, the through line in fiction is invisible. But the reader will sense it through the various aspects of your story.

“Some writers think of the throughline as the embodiment of the main character’s conscious desire. The character knows what he wants and knows that he wants it. This personal hunger, shared by the viewer, drives the story and shapes the narrative” (Writer’s Digest, accessed Oct. 2, 2025, link below).

When I first read what a through line was, it sounded a lot like a novel’s premise. It is similar, yet there is a difference. A premise is the “what if” of your story. The through line is the action/emotion that carries your story from beginning to end. (And for all the books I have on craft—shelves and shelves—none has ever mentioned through lines. So don’t feel bad if you haven’t heard the term before.)

Example:
Premise: What if a woman is given a strings-attached inheritance and must quit her job in order to claim the inheritance, yet face the off-chance she won’t meet the required “strings”?
Through line: The journey of a woman’s struggle to claim God’s abundant life.

Accomplishing This

1. Clarify your core message (preferably before writing your story). To find this, ask yourself “What is the one struggle/idea/theme that runs under my whole story.” With Claiming Her Inheritance, my main idea was that God’s love for us and promises of His Word are our inheritance. I didn’t have it written down, and I didn’t realize it was a through line, yet it guided me as I wrote the story.
2. Weave the through line into the protagonist’s story arc. It needs to show up in the character’s choices and changes as the story progresses. Every major plot point should, in some way, force the protagonist to confront it. Example: Sally Clark continually faces choices that test her identity—child of God vs. a nobody, unworthy vs. worthy.
3. Echo it in subplots and motifs. If you use subplots, they need to reinforce or contrast the through line. Example: In To Kill a Mockingbird, the subplot with Boo Radley echoes the larger theme of prejudice and justice.
4. Make it invisible to the reader. You don’t want to preach or teach a lesson to the reader. In fiction, your through line must be felt, not told. Let it appear through the action, conflict, and resolution.
5. Revise with the through line in mind. Once you finish your draft, read the story using your through line like railway tracks. Does each major scene push the protagonist along the railway? Does any scene wander off the tracks too far? Does the subplot help or distract?

You might find your through line changing as you write (new ideas always show up on the journey of writing), so be flexible. Just make sure you review each scene to ensure it meets your new through line.

Fiction Examples

The Hunger Games (Suzanne Collins)
Premise: What if a teenage girl is forced to fight to the death in a televised survival competition?
Through line: Katniss’s journey of survival becomes a fight for autonomy and the protection of those she loves in a world rigged against her.
How it shows: Every choice—volunteering for Prim, faking romance with Peeta, refusing to kill him at the end—circles back to her through line of resisting oppression and protecting loved ones.

Harry Potter and the Sorcerer’s Stone (J.K. Rowling)
Premise: What if an ordinary boy discovers he’s a wizard destined for greatness?
Through line: Harry’s longing for belonging and identity drives the entire story.
How it shows: From finding a family in Ron and Hermione, to confronting Voldemort’s return, everything connects to Harry discovering where he fits and who he truly is.

Finding Nemo (Pixar)
Premise: What if a timid clownfish must cross the ocean to rescue his son?
Through line: Marlin’s struggle to overcome fear and learn to trust others (and let go).
How it shows: Each adventure (with Dory, with the turtles, in the whale) forces him to release control a little more, culminating in trusting Nemo’s plan at the climax.

Do you know the premise and through line for your current WIP. Now’s the time to start. Take your writing to a new level. Put your premise and through line in the comments.

Other resources:
“Story Premise – What It Is and How to Develop It”
“How to Structure a Premise for Stronger Stories”
“What Is the Throughline of a Novel and Why It’s Important You Have One”

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