This is a great book and one that I wish that was available 3, 10, or 20 years ago. It's completely the opposite of what I remember being taught about how to be a salesperson, which was simply cold calling and asking for an appointment with a cold prospect.
This book teaches how to make a cold call a warm call and how to make an Up-Front Contract with the person you're speaking to, so that you can find out quickly if there is an opportunity for a further discussion, and using an Up-Front Contract is critical when having that conversation.
By mastering these techniques through diligent practice, I believe there can be a significant impact upon a salesperson's performance that will ultimately result in greater sales and building a greater network of clients who are comfortably willing to introduce you to others.
This is a book that deserves to be read at least once a year if you're in sales.