Secrets of the ninja

"Traditionally, the Ninja's duty demands one, or all, of three actions: espionage, sabotage, assassination. The taboos against death-dealing keep the agents of ninjitsu cloaked in the shadow of their own deeds. But, the successful Ninja owes his very life to those shadows, within whose darkest shade he waits in ambush, invisible even to those who search. Secrets of the Ninja is the first book to describe the inner workings of this remarkable legion"--