Mr. Boaz Aviram, who is one of the top instructors in the world, does not just offer a "manual" of how to perform Krav Maga, but a Textbook on the entire system.
I would highly recommend this volume for any serious student of the system. This is the real deal, not the watered down, McDojo versions you get from other manuals (that come in three volumes).
Mr. Aviram is not only a great instructor, but I great philospher when it comes to the serious aspects of Krav Maga and self defense.
If you are an instructor who teaches serious Krav Maga and do not have a copy of this book, then you are not teaching true Krav Maga and you are short changing yourself and your students.