I have given this book top rating because the author works very hard to give as much information as possible, and it is all very useful information. And, unless you publish in the right niche your book will sink without trace because the readers who are interested in your book will not be able to find it. Discovering the right niche for your work is not an easy task but, as the author points out, the Chinese Proverb says "Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime." This book does, indeed, teach you how to find the right niche for you. It requires a certain amount of commitment and work on your part, and this is not glossed over. But anyone who publishes already knows you have to work hard to produce a book people are prepared to pay for. The book is free at the moment; grab it while you can, but even if you have to pay for it it is worth buying.