The secret manuals of the oral tradition of the Iga and Koka Ninja, feared and respected across Japan for centuries--now in paperback Through patient and scholarly detective work, Antony Cummins and the Historical Ninjutsu Research Team have unearthed a Shinobi treasure. The 18th-century military historian Chikamatsu recorded the oral traditions of the Ninja and passed on those skills in lectures he gave at his Renpeido school of war...