The introduction to my first book took longer to write than any chapter. I rewrote it four times. The first version was too academic. The second was too personal. The third tried to do everything and ended up doing nothing.
The fourth version worked because I understood what an introduction is for: it is a promise. It tells the reader what they will get from the book and gives them a reason to believe you can deliver it.
A book introduction is the opening section that comes before chapter one. It establishes the book's purpose, introduces the author's perspective, and gives the reader a reason to keep going.
An introduction is not a preface (which explains how the book came to be) and not a foreword (which is written by someone other than the author). An introduction is the author's direct address to the reader about what the book will accomplish.
In fiction, an introduction is optional and rare. In nonfiction, it is essential. The introduction is where nonfiction readers decide whether the book is worth their time. A strong introduction can sell the book to someone browsing in a bookstore. A weak one can lose a reader who already bought it. Stephen King's On Writing: A Memoir of the Craft is one of the best examples of a nonfiction book where the introduction earns the reader's trust.
The Four Jobs of an Introduction
Job 1: Hook the Reader
The first paragraph of your introduction has one job: make the reader want to read the second paragraph. The same principle applies to opening a novel or a screenplay, but nonfiction introductions have less patience from readers.
Effective hooks for introductions:
A personal story that illustrates the problem the book addresses
A startling fact that challenges the reader's assumptions
A question the reader is already asking themselves
A bold claim that the book will prove
Avoid starting with a dictionary definition. Avoid starting with "This book is about..." Avoid starting with a historical overview that takes three pages to reach the point.
When I wrote my books, I always started the introduction with a specific moment: a problem I faced, a conversation that changed my thinking, a failure that led to a discovery. Specificity creates connection. Abstraction creates distance.
Job 2: State the Promise
After the hook, tell the reader what they will gain from reading the book. This is the book's promise.
The promise should be specific and achievable:
"By the end of this book, you will know how to plan, draft, and revise a complete novel."
"This book will teach you the five systems that every successful self-published author uses."
"After reading these pages, you will understand why most writing advice fails and what to do instead."
The promise gives the reader a reason to invest their time. It also creates accountability: the rest of the book must deliver on what you stated here.
Job 3: Establish Your Credibility
The reader needs a reason to trust you. Credibility in an introduction comes not from listing credentials but from demonstrating knowledge and experience.
Show credibility through:
Relevant experience. "I have written five books and managed a publication with 120 writers."
Specific results. "The system in this book has been used by over 10,000 writers."
Honest failures. Admitting what you got wrong before you got it right builds more trust than a list of achievements.
Avoid lengthy bios in the introduction. The author bio belongs on the back cover or in an "About the Author" section. The introduction should weave credibility into the narrative.
Job 4: Preview the Structure
Give the reader a roadmap. A brief overview of how the book is organized helps them understand what to expect and allows them to navigate to the sections most relevant to their needs.
Keep the preview concise:
Part One covers the fundamentals of planning your book. Part Two walks through the drafting process. Part Three handles revision and publishing.
Each chapter ends with exercises you can apply.
The book is designed to be read in order, but each chapter also stands alone if you need to jump to a specific topic.
The preview reduces uncertainty. A reader who knows where the book is going is more likely to stay for the journey.
Introduction Structure
A strong nonfiction introduction follows this sequence:
Hook (1-3 paragraphs): a story, fact, or question that grabs attention
Context (1-2 paragraphs): the problem or gap the book addresses
Promise (1 paragraph): what the reader will gain
Credibility (1-2 paragraphs): why you are the person to deliver on the promise
Preview (1-2 paragraphs): how the book is organized
Transition (1 paragraph): a sentence or two that leads into chapter one
This structure works for most nonfiction books. Adjust the proportions based on your genre and audience. Business books may emphasize the promise and credibility. Memoir introductions may lean more on the personal story.
Common Mistakes in Book Introductions
Starting Too Broad
"Since the beginning of time, humans have told stories." This kind of opening feels grand but communicates nothing specific. Start with a concrete moment, not a universal truth.
Making It Too Long
An introduction should be 1,500 to 3,000 words for most nonfiction books. Longer introductions lose the reader before the book even starts. If your introduction is running past ten pages, you are including material that belongs in chapter one.
Telling Instead of Showing
"This book is very practical and will change how you think about writing." Telling the reader the book is good does not make them believe it. Show them by starting with a compelling story or insight that demonstrates the book's value.
Burying the Promise
Some introductions take five pages to reveal what the book is about. The reader should know the book's purpose by the end of the first page. Front-load the promise.
Skipping the Introduction Altogether
Some writers go straight to chapter one, reasoning that the content speaks for itself. For nonfiction, this is a missed opportunity. The introduction establishes the frame through which the reader will interpret everything that follows.
Writing the Introduction: Process
Write the introduction last. This seems counterintuitive, but the introduction summarizes and promises what the book delivers. You cannot promise what you have not yet written.
Draft the book first. Then return to the introduction knowing what the reader will gain, what stories best illustrate the book's themes, and how the structure plays out.
When you sit down to write it:
Freewrite for ten minutes about why you wrote the book
Identify the single best story that represents the book's core message
Draft the six-part structure above
Cut until every paragraph earns its place
Revise the introduction more than any other section. It is the first thing readers experience. It sets the tone for everything that follows.
An introduction is not a formality. It is the handshake between you and the reader. Get it right, and the reader trusts you enough to follow wherever the book leads. Get it wrong, and they set the book down before chapter one.
Final Thoughts
A strong book introduction earns the reader's attention by communicating why the book matters and what they will gain from it. Hook them early, make a specific promise, and establish trust before leading them into the first chapter.
Related Resources
FAQ
Here, I will answer the most frequently asked questions about how to write a book introduction.
Should fiction books have an introduction?
It is not necessary. Fiction readers expect to start with the story. Prologues serve a similar function in fiction, setting up context or backstory, but even prologues should seldom be used. Most fiction editors recommend starting with chapter one.
How is an introduction different from a prologue?
An introduction is the author speaking to the reader about the book. A prologue is part of the story itself, a scene set at a different time or from a different perspective than chapter one. Introductions are nonfiction conventions. Prologues are fiction conventions.
Can I include the introduction in my word count?
Yes. The introduction is part of the book's content and counts toward the total length. For nonfiction books targeting 50,000 to 70,000 words, a 2,000-word introduction is a reasonable proportion.
Should the introduction mention the target audience directly?
Yes, but without going into too much detail. A line like "This book is for writers who have started multiple projects but struggled to finish any of them" helps readers self-identify. Keep it to one or two sentences.
When should I write the introduction?
After the book is drafted. You need to know what the book contains before you can introduce it. Some writers draft a rough introduction early for direction, then rewrite it after the book is complete.
How do I know if my introduction is working?
Give it to three people who match your target reader. Ask them two questions: after reading just the introduction, do you want to keep reading? And can you tell me what the book promises? If they say yes to the first and can answer the second accurately, the introduction works.