Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A truly captivating work, a vortex of information!

Randall G. Hassell is again shown here, to be in "top form"! This captivating work, is a compilation of tangibly "intense research". This book is living snapshot into the martial arts, and scrutiny of one particular "family" of Martial Artists. It's focus is the passionate discussion of the evolution and development of the proverbial "family" known as Shotokan Karate. Agree or disagree with its author, but the presentation is compelling, EXTREMELY articulate, a very balanced and interesting read!