A book description has one job: to make the right reader want to read the first page. It is not a synopsis, and it does not need to cover the whole plot or every chapter.

A structure that works for fiction

  1. Hook (one line): a striking situation, question or contradiction.
  2. Character and world (2–3 sentences): who we follow, what they want, what is normal for them.
  3. Disruption and stakes: what goes wrong and what they stand to lose.
  4. The choice or question the reader will want answered — never the answer.
  5. Positioning line: the genre promise, often with comparable authors or titles ("For fans of…").

A structure that works for nonfiction

  1. The problem the reader recognises in themselves.
  2. The promise: what will be different after reading.
  3. The method or insight that makes this book different.
  4. What's inside: three to five concrete takeaways, often as a short list.
  5. Credibility: why the author can be trusted on this subject.

Length and format

  • Back cover: about 150–200 words, plus endorsements and a short bio if space allows.
  • Retailer page: 150–300 words is typical. Amazon allows up to 4,000 characters, but readers rarely need that much.
  • Put the hook in the first line — many stores truncate after a few lines.
  • Use short paragraphs and, for nonfiction, a bulleted list. Bold sparingly.

Common mistakes

  • Opening with backstory or world-building instead of a hook.
  • Naming too many characters or places.
  • Describing themes ("a story about love and loss") instead of situations.
  • Over-claiming ("the best book you will ever read").
  • Copying the description into keywords — they serve different purposes.

Test it

Read the description aloud. Show it to people who have not read the book and ask what they think it is about and who it is for. If their answers match your intended reader, it works.