Shotokan’s Secret: Expanded Edition by Bruce Clayton
A very interesting book for both the martial artist and the historian. Mr. Clayton has done extensive research into finding the environment that drove the creation of hard style linear Karate. This system of martial arts came about in a specific time and place. A time and place that previously predominately practiced only empty handed systems based on Southern Kung Fu systems. Those systems had to be empty handed systems, because possession of a sword or any other restricted weapon by an Okinawan was punishable by death!
The first half of the book is pure history. The second half breaks apart the Shotokan katas and points out the hidden techniques. Techniques that had to be hidden at time the system was created. Very interesting stuff for the martial arts historian.