Most proposals are not rejected because the idea is weak. They are rejected because the editor could not find the book inside the document. Commissioning editors read in bursts — on a train, between meetings, at the end of a long day — and they are looking for a reason to stop. Your proposal has one job: to give them reasons to keep going, and to make it easy to picture the finished book on a shelf.
What follows is the checklist used by agents and editors who read these documents for a living: twelve elements, roughly in the order that works.
Keep the overview to 300–500 words, written in the present tense as though the book already exists. Open with the problem your reader has or the promise you are making. Not with your childhood, not with a dictionary definition, not with "This book will explore...". One sentence should carry the whole idea, the kind of sentence that could sit on a back cover without embarrassment. Then explain what the book is, who it is for, and what changes for the reader by the final page.
Put the basics on the same page: title and subtitle, total word count, and an honest delivery date. Editors like knowing what they would be buying.
Be plain and be specific. What qualifies you to write this book? Professional experience, original research, access to people or archives, lived experience — name it and date it. If you have taught, practised or spent fifteen years in the field, say so in a sentence and move on.
Platform matters, but inflation is fatal; editors check. If you have a newsletter, a podcast, a course, a speaking diary or a professional network, give real numbers and be clear about what you can genuinely do when the book appears. A modest, verifiable audience beats a vague claim of "a large following" every time.
If you are not a household name, answer the obvious question directly: why you, and why now? Enthusiasm is not an answer. Access, expertise or a fresh argument is.
This is the section writers rush, and it is the one that shows whether you understand the shelf your book would sit on.
Name three to six books published in recent years, and for each give the author, publisher, rough publication year and a single line explaining how yours differs. "Readers of X will recognise the territory, but where X stays with the politics, this book follows the people" is useful. Claiming your book has no competition is not.
Be narrow enough to be believable. Not "anyone interested in history" but "readers who buy paperback narrative history, follow a handful of long-form history podcasts, and browse museum gift shops and high-street bookshops". Say what else they buy, where they buy it, and why they would choose your book over the one beside it. If there is a real reason the subject matters now, state it in two sentences. Do not manufacture a trend.
The outline proves you have thought past the idea. Number the chapters and give each two or three sentences: what it covers, what happens in it, what the reader takes from it. Watch the arithmetic. If you promise twenty chapters and 80,000 words, that is roughly 4,000 words each, and an editor will notice an outline that suggests otherwise.
Flag anything that needs handling: permissions for quotations or images, consent and anonymity for people you have interviewed, and how you will source your material. If your book offers advice on health, money or legal matters, say who will check it — and take proper professional advice in those areas yourself before you promise anything on the page.
Two sample chapters is the usual ask, or one chapter plus the introduction: roughly 5,000 to 10,000 words of finished prose. Choose the chapter that best represents the finished book, which is often not chapter one, and write it properly. Notes, bullet points and "text to follow" will not survive a close read, and the sample is always read closely.
Then the practicalities:
Work through the list in order and you will have something an editor can read in ten minutes and understand completely. That is the whole aim. If a section feels thin, it usually is, so fix it there rather than hoping nobody notices — and read the submission guidelines once more before you press send.
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