This is a classic text on the mystical traditions of the ninja. It details the art of concealment and espionage, including methods of disguise, survival techniques, and face reading. The text also discusses the connection between the ninja and yamabushi, warrior monks with supernatural powers. The ninja's art of ninjutsu, which was transmitted in secret schools, was both invisible and indispensable. This book may contain a sharpie mark on the top or bottom edge and may show mild signs of shelfwear.