This won't be very long, since I am not overly concerned with being critical of this book. However, the five-star rating is somewhat misleading.
Nelson's book is essentially a 323 page list of female nonverbal communication patterns and behaviours, contrasted with a list of male nonverbal communication patterns and behaviours. The first 100 or so pages provide a psychological analysis of the reasons for the communication patterns the author discusses. The extent to which the author "moves beyond" simply stating the differences between genders, is a "Gender Rx" at the end of every chapter, that basically tells women to use more "male nonverbal behaviour" and vice versa for males. Not an extremely useful book if you have studied nonverbal communication at any length.
This isn't a terrible book by any means; however, it is completely undeserving of a five-star rating.