How to Write a Book Premise & Synopsis
Before you write 80,000 words, you need to know what your book is about in one sentence. That sentence is your premise. The synopsis is the expanded version — a map of your entire story. Here is how to write both.
What is a premise?
A premise is a single sentence that captures the core of your story. It answers: what happens, to whom, and what is at stake. Think of it as the seed your entire book grows from.
Examples of strong premises:
- The Hunger Games: A teenage girl volunteers to fight to the death in a televised arena to save her sister.
- Gone Girl: A man becomes the prime suspect when his wife disappears — but nothing is what it seems.
- Pride and Prejudice: A sharp-tongued woman and a proud aristocrat clash repeatedly before discovering they have misjudged each other.
Notice the pattern: a character, a situation, and tension. If your premise has all three, you have a story worth writing.
Premise vs. synopsis vs. outline
These three tools work at different levels of detail:
- Premise (1 sentence): What your book is about at its core. The elevator pitch.
- Synopsis (1–3 pages): A narrative summary of your entire story, including the ending. Used for planning and for querying agents.
- Outline (5–30+ pages): A detailed chapter-by-chapter breakdown. Some writers swear by it; others skip it entirely.
You need a premise before you start writing. You may or may not need a synopsis or outline — that depends on whether you are a plotter or a pantser. But even pantsers benefit from knowing their premise.
How to write your premise
Use this formula as a starting point:
When [inciting incident], [character] must [goal] or else [stakes].
Fill in each piece:
- Inciting incident: The event that disrupts your character's normal life.
- Character: Who your story is about. Use a descriptor, not a name — "a disgraced detective" is more interesting than "John."
- Goal: What they need to accomplish.
- Stakes: What happens if they fail. The higher the stakes, the more compelling the premise.
Spend an hour on this. Rewrite it five or ten times. A strong premise makes the rest of the writing process dramatically easier.
How to write your synopsis
A synopsis tells the whole story in 1–3 pages, written in present tense and third person. It includes the ending — do not be coy. A synopsis is a planning tool, not a teaser.
Structure your synopsis around these beats:
- Opening: Who is your character and what is their normal world?
- Inciting incident: What disrupts everything?
- Rising action: What does your character try? What goes wrong?
- Midpoint shift: What changes the character's understanding of the problem?
- Climax: The final confrontation or decision.
- Resolution: How the character and their world have changed.
Write it plainly. Focus on cause and effect — "this happens, so this happens, which leads to this." If you cannot summarize your story this way, you may not know your story well enough yet. That is fine — the synopsis is how you figure it out.
Common mistakes
- Too vague: "A young woman goes on a journey of self-discovery" — this could be any book. Add specifics.
- No stakes: If failure has no consequences, there is no tension.
- Too many characters: A synopsis should focus on 1–2 main characters. Side characters can be mentioned but should not dominate.
- Hiding the ending: A synopsis is not a query letter. Include how the story ends.
- Skipping the premise entirely: Many writers jump straight to drafting without knowing what their book is about. The result is a meandering first draft that takes twice as long to revise.
Test your premise
A good premise passes three tests:
- Can you explain it in 15 seconds? If it takes longer, it is too complicated.
- Does it create a question? A premise should make someone ask "what happens next?"
- Would you read this book? If your own premise does not excite you, it will not sustain 80,000 words.
From premise to first draft
Once you have your premise and optionally your synopsis, the next step is simple: set a daily word count goal and start writing. Your premise is your compass. When you get lost in the middle of your draft, come back to it. Every scene should serve the premise.