Written by the first American ninjutsu teacher, this book covers the history of ninjutsu, philosophy, fighting, the mind as a tool of the spirit, active meditation, extended realities and the art of understanding. Fully illustrated techniques with step-by-step photos and instructions.

The "Ninja" series 1-6, published in the years between 1980 -1989(vol 6 was just published in 2007) offers the higher-level philosophical aspects of the ninja arts with a look at the combat techniques in action. These were the original volumes that identified Stephen K. Hayes as an extraordinary writer-scholar willing to explore the spiritual significance of authentic warriorship to a depth unapproached by any martial arts writer before .

Vol. 1: "Spirit of the Shadow Warrior" deals with 5 elements of responding to threat, armed and unarmed combat, sensing the imperceptible intentions of others, special section on meditation for the warrior