A first English-language translation of a highly sought collection of historical documents illuminates the secret practices, techniques, philosophies and lifestyles of the shinobi, from the Shinobi Hiden 'Secret Ninja Tradition' and the Edo period Koka Ryu Ninjutsu Densho to the three Gunpo Jiyoshu shinobi scrolls and 100 culturally informative ninjutsu poems. Original.