How to Write a Book Synopsis for Agents and Publishers
An agent reads 50 synopses a day. They decide in minutes whether to read further. Your synopsis has one job: influence that decision in your favour. Not through marketing language, not through adjectives — through clarity, professionalism, and a story that sounds compelling in two pages.
This guide covers exactly what goes in a synopsis, how to write the plot summary (including the part most authors get wrong), and what kills a submission before an agent reads the first chapter.
What a Synopsis Is — and What It Isn't
A synopsis is not a plot summary dressed up as marketing copy. It's not a teaser. It's not a pitch. It's a professional document written for someone who evaluates manuscripts every day — a clear, factual account of your book, demonstrating that you know your story and can communicate it precisely.
What it shows an agent or publisher: I know my characters. I know my structure. I can write at a professional level. I'm not wasting your time.
The standard length for UK and US submissions is typically 1–2 pages single-spaced (roughly 500–1,000 words). Some agents specify a longer synopsis (up to 5 pages) — always follow the individual submission guidelines exactly.
The Structure of a Professional Synopsis
Title, genre (specific — not "fiction" but "psychological thriller for adults"), target readership, word count, and 2–3 comparable titles currently in the market. Keep this to 3–4 lines.
One or two sentences that capture the emotional premise and central conflict. This is the version of your story that makes someone want to read the plot summary. Not "this is a story about a detective" — but what makes this detective's story worth telling. Think of it as the back-cover paragraph, compressed to two sentences.
The core of the synopsis: a chronological account of the main plot, written in present tense, covering the full story arc — including the ending. See below for how to write this effectively.
Brief profiles of your main characters (no more than 2–3 sentences each): name, role, essential trait, and how they change over the course of the story. Only major characters — not every named person who appears.
Your relevant publishing history, awards, readings, or — if none — your professional background if it's relevant to the manuscript. Keep this factual and brief. Don't apologise for being a debut author.
The Plot Summary: The Part Most Authors Get Wrong
The plot summary is the heart of your synopsis, and it's where most submissions fail. Two specific mistakes account for the majority of problems.
Mistake 1: Not revealing the ending
This is the most common error and the most damaging. Many authors withhold the ending to "create suspense" or "make the agent want to read the book." This has the opposite effect. An agent needs to know whether your story works — whether the conflict resolves coherently, whether the character arc completes, whether the promise of the opening is fulfilled. A synopsis that ends with "and then everything changes..." gets rejected, not because the agent doesn't want to know what happens, but because withholding it signals that you don't understand the purpose of the document.
Mistake 2: Summarising everything instead of selecting
A plot summary is not a scene-by-scene account of your novel. It covers the main narrative arc, the central conflict, the key turning points, and the resolution. Secondary characters, subplots, and minor scenes should only appear if they directly drive or illuminate the main story. A synopsis that tries to include everything becomes unreadable — and signals that the author hasn't understood which elements of their story are load-bearing.
The test: after reading your plot summary, would an agent understand the protagonist's goal, the central obstacle, the turning points that force the story's direction, and how it resolves? If yes, the summary works. If not, something is either missing or buried under too much detail.
Writing in present tense
Always write the plot summary in present tense: "Thomas arrives in the city and discovers..." — not past tense. Present tense reads as more immediate and alive. It's the convention because it works.
How AI Can Help with Your Synopsis
EPOS-AI's synopsis generator works from your actual manuscript. Rather than asking you to summarise your own book (which is genuinely difficult — you're too close to it), it extracts the key structural elements from the text itself: protagonist goal, central conflict, turning points, character arcs, resolution. The result is a draft synopsis that you then refine for tone and emphasis.
The advantage: because EPOS-AI has read your whole manuscript, the synopsis it generates is accurate. It doesn't misremember which character does what, or confuse the timeline, or omit the resolution. It's working from the source.
For the traditional publishing route: Finding a Literary Agent in 2026 and Writing a Book Proposal for Publishers.
The Most Common Mistakes — Summary
- Withholding the ending — always reveal it, fully
- Writing in past tense — use present tense throughout
- Including too many subplots — focus on the main arc
- Writing like a pitch — professional and clear, not promotional
- Ignoring submission guidelines — length and format requirements vary by agent; follow them exactly
- Forgetting the character arc — agents want to see how your protagonist changes, not just what happens to them
From manuscript to synopsis — one click
EPOS-AI generates a draft synopsis from your finished manuscript. Then you shape it. 7 days free.
Start Writing FreeFurther reading: Writing a Book Proposal for Publishers · Finding a Literary Agent 2026 · Self-Publishing as an Alternative