This book was written by a man who combines in one person a Japanese historian and a practitioner of traditional Japanese martial arts from the Katori Shinto-ryu school. It is completely unique in the sense that the author relies on materials practically unknown outside Japan: research by Japanese historians of ninjutsu, ancient chronicles, treatises of the ninjas themselves. The book reads like a thrilling action movie, but at the same time everything it says is historically accurate. This book, for the first time in Western and domestic literature, gives accurate answers to questions about who real and not mythical ninjas are, how and when they appeared on the historical stage, how they performed their amazing deeds, and when and why they disappeared. She leaves no stone unturned against the claims of numerous impostors that they belong to the true tradition of ninjutsu. Any person seriously interested in the martial arts of the East is simply obliged to read this book. The book is posted with the permission of the author. Author's websitewww.kyokushinkan.ruE-mail:[email protected]