King talks about the process of writing openly and honestly. To him, writing is an honest profession. A real writer writes for himself, and writes all at once with no interruptions. A real writer writes clearly and plainly, with little frill, and writes first and edits later. Writing is about baring your soul, but it is also about putting words to paper.
It's part memoior and part exposition. King talks about the rules of writing, and the craft of becoming a good writer. He also discusses his personal journey as a writer. He discusses how he developed certain writing/working habits, his highs and lows as a professional writer, and his choice of genre. It's a great mix of personal story and sound advice.