What are 15 for the book Secret?

Please clarify your request. "15 for the book Secret" is not a clear phrase. Do you mean:

* 15 key points from the book The Secret?

* 15 things you learned from The Secret?

* 15 ways to apply The Secret in your life?

* 15 quotes from The Secret?

* 15 examples of how The Secret works?

Please provide more context so I can help you with your request.