I was reading The Hero of Ages the other day when my wife looked at the enormous book in my hands and asked:
“Are you going to read that thing or do bicep curls with it?”
She was joking about its somewhat ridiculous size, but then she asked a perfectly reasonable question:
“Why are all these fantasy and science-fiction books so huge? And why are they always trilogies, or even longer?”
My first response was that they aren’t all enormous. Both genres have plenty of excellent standalone novels. But she wasn’t wrong, either. Walk through the fantasy section of a bookstore and you’ll see shelves filled with thick books bearing phrases like Book One of the Trilogy. Some series stretch across ten, twelve, or fourteen volumes.
Why does speculative fiction so often require that much space?
I think much of the answer comes down to world-building.
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Every Story Needs a World
All fiction requires some degree of world-building. Even a novel set in present-day New York must establish its neighbourhoods, homes, workplaces and social circles. Historical fiction has the added burden of recreating an earlier version of our world.
But these stories begin with an enormous advantage: we already understand the underlying reality.
An author doesn’t have to explain what a city is, why money matters, how gravity works or what happens when someone is injured. We recognize governments, religions, families, schools and workplaces even when their particular details differ from our own.
Fantasy and science fiction can’t always rely on that shared understanding.
Before Brandon Sanderson can tell the full story of Mistborn, he must introduce us to a world buried beneath falling ash, ruled by an apparently immortal emperor and governed by unfamiliar magical laws. Those laws can’t simply exist in the background. We need to understand them well enough to believe that the characters’ choices and their consequences make sense.
The Wheel of Time must establish its nations, cultures, prophecies, history and relationship with magic. The Expanse must show us how humanity has changed after spreading across the solar system, including the political and cultural divisions between Earth, Mars and the Belt.
These books aren’t merely telling us what happened. They’re teaching us how an entire reality works.
The Context Tax
That creates what I think of as a context tax.
Every story needs characters, conflict and momentum. Speculative fiction often has to provide all of that while gradually explaining a civilization the reader has never encountered before.
- Who holds power?
- What does this society believe?
- What technology or magic is possible?
- What are its limitations?
- What languages do its people speak?
- What happened before the story began?
- Why do the characters see their world the way they do?
Sometimes the author must invent more than a setting. They must create entire cultures and languages, complete with their own histories, values, expressions and ways of understanding the world. Even when readers never learn the language itself, they need to feel that it belongs to people who existed before the story began and will continue to exist after it ends.
Deliver too little information and the world feels arbitrary or confusing. Deliver too much at once and the novel becomes an encyclopedia.
The best speculative fiction hides those explanations inside the story. We learn the world by watching people live in it. That approach feels natural, but it takes time and pages.
Epic Stories Need Room to Change
Then there’s the scale of the story itself.
Many fantasy and science-fiction novels aren’t about one isolated event. They chronicle the collapse of kingdoms, wars between civilizations, journeys across continents or encounters that transform humanity’s understanding of the universe.
Their characters must grow along with that expanding story.
We see the descent, the hero’s journey and the redemption arc. We watch idealists become hardened, cowards discover courage, and powerful people learn the cost of using that power. Relationships form, fracture and sometimes recover. Characters fail before they become capable of confronting what awaits them.
These arcs can exist in any genre, of course. A short literary novel can contain a devastating transformation. But when personal change unfolds alongside wars, political upheaval, ancient prophecies or the fate of entire worlds, the story often needs more room to breathe.
A single novel may introduce the world and its conflict. The next dismantles what the characters thought they understood. The final book forces them to face the consequences.
By the time you reach The Hero of Ages, the ending matters because two earlier novels taught you what this world is, who these people were and what they’ve already sacrificed.
Why Some Standalones Work
There are also terrific standalone science-fiction novels. Project Hail Mary is an obvious example.
It introduces unfamiliar science, an extraordinary mission and alien life without requiring a shelf of sequels. Part of the reason it can do that is that its foundation is still recognizably ours. We understand Earth, space travel, scientific experimentation and the possibility of extraterrestrial life.
The novel must introduce a crisis and explore its consequences, but it doesn’t have to construct every part of reality from the ground up.
That doesn’t make its achievement smaller. If anything, telling a complete speculative story within one volume requires tremendous discipline. The author must decide which parts of the world deserve explanation and which can be supported by knowledge the reader already possesses.
Some stories need an entire invented history. Others need only one extraordinary idea placed inside a world we recognize.
The Reward for the Reader
Long books and sprawling series ask a lot from us. They require time, attention and trust. Starting a fourteen-book series can feel less like choosing a novel and more like signing a contract.
But the commitment is also part of what makes these stories powerful.
After hundreds or thousands of pages, an invented world can begin to feel strangely real. Its places carry memories. Its history has weight. Its characters feel less like people we’ve observed and more like people we’ve accompanied.
That depth creates something a shorter visit can’t always reproduce: the feeling that we’ve lived somewhere else.
And that, for me, is the real appeal.
Sometimes I don’t want a story that takes place in a slightly altered version of the life I already know. I want to step completely outside it. I want unfamiliar skies, impossible civilizations and rules that must be discovered as the story unfolds.
I want to escape, not merely to another location, but into another reality.
When that’s what a book is offering, I don’t mind if it takes three volumes to get there.
Books mentioned
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