What Is a Synopsis, and How Do You Write One?

A synopsis is a short summary of your entire book, written in prose, that tells an agent what happens from beginning to end. Many agents ask for one as part of a submission, alongside your covering letter and sample chapters.

It is the part of the process writers tend to dread most, partly because it asks you to do something that feels backwards: reduce a book you spent months or years on down to a page, and give away the ending. But that is exactly what it is for, and once you understand why, it gets easier. If you are new to all of this, our post on how to get a book published covers the whole route.

What a synopsis is for

The synopsis answers a question the sample chapters cannot: does the whole story work? Your opening pages might be gripping, but an agent needs to know that the plot holds together, that the ending pays off, and that there is a complete, structured book here. The synopsis shows them the shape of the whole thing at a glance.

This is why it must include the ending. A synopsis is not a teaser and not a blurb. Holding back the ending to keep them guessing is the single most common mistake.

How long it should be

Usually short. Many agents want around one page (of reasonably sized and spaced text). As with everything in submissions, follow each agent's stated preference. If they do not specify, one clear page is a safe default. The discipline of keeping it short is part of the point: it forces you to show the spine of the story rather than every twist.

How to write one

Write in the present tense and the third person. "Sarah discovers a letter," not "Sarah discovered" or "I discover." This is the standard convention, regardless of what tense or viewpoint your actual book uses.

Follow the main thread. A synopsis is not a chapter-by-chapter list and it cannot fit every subplot. Focus on the central character, the main plot and the key turning points: what sets the story in motion, the major complications, the climax and the resolution. Leave out minor characters and side stories unless they directly drive the main one. If a detail does not change where the story goes, it can usually be cut.

Show cause and effect. The story should read as a chain, not a list of events. This happens, which forces that, which leads to this. Agents are looking for whether the plot has a working engine, so the connections between events matter more than the events themselves.

Cover the character's arc, not just the plot. Note how your main character changes, and what the story costs them. A synopsis that is only a sequence of plot mechanics can feel flat. A short sense of the emotional through-line brings it to life.

Name characters sparingly, and clearly. Introduce the few people who matter. Too many names too fast is hard to follow.

Tell the ending plainly. State how it resolves. This is not the place for "to find out, read the book."

The mistakes that come up

The biggest, again, is hiding the ending. Tell them how it ends.

Trying to include everything is the next. A synopsis that lists every subplot and minor character becomes a tangle. Cut to the spine.

Writing it as marketing copy rather than a summary also misses the point. Phrases like "a thrilling rollercoaster you won't be able to put down" belong nowhere near a synopsis. It is a clear account of what happens, not a sales pitch.

A good exercise is to imagine telling someone about your book. What is the story? How would you retell it in conversation? That is what a synopsis is doing: boiling it down to a single page of explanatory text.

A note on going deeper

This covers what a synopsis is and how to approach one. For a more in-depth look, check out the PairPi Submission Toolkit.

The short version

A synopsis is a one-page, present-tense, third-person summary of your whole story, including the ending. Follow the main character and the central plot through its turning points, show how one event causes the next, note how the character changes and state how it resolves. Keep it clear rather than clever, match each agent's stated length and format, and remember that giving away the ending is the whole point.