What are the real ninjas? How many diverse legends and stories there are about the great spies and infiltrators of the Japanese Middle Ages - ninjas. These are invisible people who are able to disappear from sight in the blink of an eye, kill their rival with a slight press of their fingers or even a glance. These are clans of killer warriors in which amazing fighters have been brought up since childhood; each can handle several trained samurai. Today dozens of films have been shot about them, novels have been written. About this - a new bestseller by Alexei Maslov.