One of the questions I’m often asked is, “How do you know when a book should become a series?” The truth is, there’s no formula. Some series are planned from the very beginning, while others happen almost by accident.

I’ve experienced both.

The To Love a Sportsman series was always intended to be a series. But my other two series weren’t. They grew naturally because readers wanted more, and I wasn’t ready to leave those worlds behind.

If you’re wondering whether your story has series potential, here are a few things to think about.

1. Is there reader demand?

The biggest clue often comes from your readers.

When I wrote Starting Over, I hadn’t planned on writing another book. But the novel was so well received that readers began mentioning in their reviews that they wanted to revisit Henderson County and meet more of its residents.

That was enough for me to start thinking beyond a single novel.

Sometimes the best reason to write another book is because readers genuinely want to spend more time in the world you’ve created.

2. Does your world have enough characters?

A great series needs more than one interesting protagonist.

In my Starting in Henderson County series, each book follows different characters living in the same small town. The town itself almost becomes another character, connecting each story.

The Boothbay Harbor Series works differently. Each novel focuses on a different sibling in the same family, allowing every character to have their own romance while still contributing to the larger family story.

Whether your books revolve around a town, a family, a workplace, or a friend group, your world needs enough compelling people to carry multiple novels.

3. Is there an overarching theme or story?

Readers enjoy seeing continuity across a series.

In the Starting in Henderson County books, the common thread is second chances. Every couple has a different story, but that central theme ties the books together.

The Boothbay Harbor Series explores something much deeper. Each sibling is shaped by growing up with alcoholism and the breakdown of their parents’ marriage. Every book examines how childhood experiences continue to influence adult relationships.

A series doesn’t need one giant plot that spans every book, but it should have something that connects the stories emotionally or thematically.

4. Is there enough story to justify another book?

This is probably the hardest question to answer honestly.

Not every side character deserves their own novel.

I’m wrestling with this right now in the To Love a Sportsman series. The fourth book has gone through draft after draft because I simply didn’t lay enough groundwork for that character in the previous books. I’m constantly writing, rewriting, and trying to discover whether there’s enough story there to sustain an entire novel.

Sometimes there isn’t.

It’s better to end a series while it’s still strong than to keep writing books simply because readers expect another one.

5. Don’t force a series

We’ve all read series where one or two books feel like filler.

You can almost tell the author—or perhaps the publisher—wanted to extend a successful series, even though the story had already been told.

Every book should earn its place.

If a novel doesn’t reveal something new about the characters or move the overall story forward, readers will notice.

Quality will always outlast quantity.

6. Think about your release schedule

Timing matters.

Some authors release a new book every month through careful planning and an incredibly disciplined writing process.

Others publish one book a year.

Some of my favorite authors take one or even two years between releases, and honestly, I think that’s a healthy pace. It’s long enough to produce a polished book but not so long that readers completely forget the series.

There’s no “right” schedule. The important thing is consistency and delivering your best work.

7. Give every book its own satisfying ending

This applies especially to nonfiction, but it also matters in fiction.

I’ve seen authors stretch one idea across three books, ending each one on a cliffhanger simply to sell the next installment.

Readers are smart.

In today’s economy, people have countless entertainment options competing for their time and money. They can usually tell when a series has been artificially expanded.

Each book should provide genuine value and feel complete on its own, even if there are threads that continue into future books.

Respect your readers, and they’ll keep coming back.

8. Be willing to let the series grow naturally

Not every series begins with a grand master plan.

Apart from To Love a Sportsman, none of my series started with the intention of becoming multiple books.

I simply fell in love with the settings and the characters. There were still stories left to tell, and readers wanted to hear them.

Sometimes that’s the best reason of all.

Final thoughts

Writing a series isn’t about producing as many books as possible. It’s about creating a world readers never want to leave.

If you’re considering turning your standalone novel into a series, ask yourself:

• Are readers asking for more?
• Does your world have enough memorable characters?
• Is there a larger emotional or thematic thread?
• Does each future book have a story worth telling?
• Will every installment stand on its own?

If the answer is yes, then perhaps you’ve found not just one story—but a whole world waiting to be explored.

Have you ever abandoned a series because it felt like it had gone on too long? Or do you have a favorite series that kept getting better with every book? I’d love to hear your thoughts in the comments.