Shape and test your book idea before you write it
A book idea is ready when you can state, in one sentence, what a specific reader will be able to do after reading it, and when a look at the books already out there shows room for yours. This stage turns a topic into a promise and tests that promise before you spend months on it.
A topic is not an idea
"Leadership," "personal finance for doctors" and "my journey in real estate" are topics. A topic tells you what shelf the book sits on. An idea tells a reader why to take this one off the shelf. The difference is a promise: who it is for, what changes for them, and how.
You already have the "who" from Stage 1. Now you sharpen the "what changes" and the "how."
Write the one-sentence promise
Use this shape. It is deliberately plain so you cannot hide behind clever wording.
This book helps [specific reader] who [situation or problem] to [result they want] by [your method, insight or approach].
Then write a second version the way a happy reader would say it to a friend. The Scribe Method's chapter on figuring out your book idea calls this the cocktail party pitch: the sentence someone uses when they recommend your book. If the two versions do not match, the book is probably about what you want to say rather than what the reader wants to get.
Weak and strong ideas, side by side
These examples are ours, written to show the difference. Each weak version is a common kind of first idea; each strong version keeps the author's expertise but adds a reader and a result.
| Weak idea | What is missing | Strong idea |
|---|---|---|
| A book about leadership lessons from my 30 years in business. | No reader, no result. Lessons are the author's, not the reader's. | Helps first-time managers in technical roles run their first year of one-on-ones, using the meeting format I used with 400 engineers. |
| Everything I know about real estate investing. | Too broad. "Everything" cannot be outlined. | Helps busy doctors buy their first small apartment building without quitting medicine, using a property-manager-first approach. |
| The importance of mindset. | A belief, not a method. Hard to act on. | Helps sales reps who freeze on price talks hold their number, using five scripts drawn from recorded calls. |
| My story of building and selling a company. | Memoir framed for the author, not the reader. | Helps founders of family businesses prepare for a sale two years out, told through the mistakes of my own sale. |
| Why culture matters. | Most readers already agree. Nothing to learn. | Helps operations leaders at 50 to 500 person companies cut turnover in frontline roles with a 90-day onboarding plan. |
Notice the pattern. Strong ideas name a reader you could find, a result they would pay for, and a method that belongs to the author. They also make the outline obvious: the 90-day onboarding plan almost writes its own table of contents.
Check the competing books on Amazon
Before you commit, spend two hours looking at what your reader would find if they searched today. You are not checking whether the topic is "taken." You are learning what readers already have, what they still complain about, and where your book fits.
Search the way your reader would
Type three or four phrases your reader would use, in their words from Stage 1, not your industry's jargon. "Cash flow for small business" finds different books than "working capital management."
List the first ten relevant books
For each, note the title, subtitle, year published and who it seems to be for. Skip books that only share keywords. A simple spreadsheet works.
Read the table of contents
Use the sample preview on the book's page to read the contents and the introduction. You will quickly see which books teach a method, which tell a story and which survey a field.
Read the middling reviews
Three-star reviews are the most useful. They come from readers who wanted the book to work and tell you exactly what was missing: "too basic," "all theory," "not for people in my industry." Each complaint that matches your reader is a gap you can fill.
Write your difference in one line
Finish this sentence: "Unlike [closest book], mine is for [reader] and shows [what it does that they do not]." If you cannot, your idea needs another pass.
What the search can tell you. No books at all may mean no one buys books on the subject, or that readers call it something else. Dozens of recent books means demand is proven and you must be specific. A handful of older books with frustrated reviews is often the best sign of all.
How narrow is too narrow?
New authors tend to fear narrow ideas, because a smaller audience feels like fewer sales. But Stage 1 already told you what success looks like, and for most professional authors it is not copy sales. A book written for 2,000 hospital supply chain directors can be a huge success if 20 of them call you.
Use these tests instead of a gut feeling:
- Too narrow: you cannot name enough readers for your goal, or the subject is fully covered in a long article. If you run out of chapters at four, it may be a white paper.
- Too broad: your outline has chapters that half your readers would skip. Your one-sentence promise needs "and" twice.
- About right: every chapter matters to every reader in your profile, and you could still fill a second book with what you left out.
When in doubt, narrow the reader, not the subject. "Negotiation for nurse managers" keeps all your negotiation expertise but makes every example, story and word choice easier.
Test the promise on real people
Say your one-sentence promise to five people who match your reader profile, one at a time. Do not explain or defend it. Then ask: "Would you read that? What would you hope it covers?"
- If they lean in and start telling you about their own version of the problem, you have a live idea.
- If they nod politely and change the subject, the result is not one they care about yet. Revisit the "to" part of your sentence.
- If they ask "how is that different from [book]?", you have your competition and must answer it in the introduction.
Write down the exact words people use. Their phrasing is usually better than yours for the subtitle and the book description, which come much later, in Stage 8 and Stage 9.
Write a short description to lock it in
Finally, write a paragraph of 200 words or fewer that answers what the book is about, who it is for and what they will get. The Scribe Method suggests this exact limit: if you cannot do it in 200 words, the idea needs more clarity. Keep this paragraph with your North Star sentence. You will check every chapter against both.
Your Stage 2 checklist
- A one-sentence promise in the "helps, who, to, by" shape.
- A cocktail party version that matches it.
- A list of ten competing books, with notes on what their middling reviews say is missing.
- A one-line difference from the closest book.
- Reactions from five real readers, with their exact words.
- A description of 200 words or fewer.
Common questions
How do I know if my book idea is good?
A good nonfiction idea passes three checks: you can state the reader's result in one sentence, real readers in your profile say they want that result, and existing books leave a gap you can fill. If any check fails, reshape the idea before outlining.
Is it bad if there are already lots of books on my topic?
Usually it is a good sign, because it proves readers buy books on the subject. The question is whether you can serve a narrower reader, a different situation or a different method better than the books already there.
Can my book idea be too narrow?
It is too narrow when you cannot name enough readers to matter for your goal, or when the topic runs out after a long article. For a book meant to win clients, a narrow reader is rarely a problem: you only need the right people to read it.
Should I tell people my book idea before I write it?
Yes. Ideas are rarely stolen, and testing your one-sentence promise on real readers is the fastest way to learn whether it lands. Watch their faces and note the questions they ask.
Sources: The Scribe Method, chapter 5 (What Is Book Positioning) and chapter 8 (Figure Out Your Book Idea), read October 20, 2026. The weak and strong idea examples were written by Scribe Media for this guide and do not describe real books.