The Book of Ninja : The Bansenshukai - Japan's Premier Ninja Manual
The Bansenshukai was written in the late 1600ís and is one of few major writings on the ways and practices of the Ninja or Shinobi. It details much of the wisdom and knowledge of this ancient sect. The Book of Ninja features a Q&A, guides on equipment, strategy, philosophy, and stories that predate every major bit of Hollywood intrigue and plot twist ever created. It also has more than its share of disappointing disclaimers, where the reader is told to refer to their local Ninja master for certain training.
It is also filled with techniques for intelligence gathering, including infiltration and disguise. It provides guidance on meteorology and forecasting. It teaches communication and behavioral science. It includes geology, geography, and architectural assessment. It is a textbook for observation, engineering, philosophy, and much more.