There are so many different legends and stories about the great spies and scouts of the Japanese Middle Ages - ninjas. These are invisible people, capable of disappearing from sight in the blink of an eye, killing their opponent with a light touch of their fingers or even a glance. These are clans of warrior-killers, in which amazing fighters are raised from childhood; each of them can cope with several trained samurai. Today, dozens of films have been made about them, novels have been written. But what are real ninjas? This is the new bestseller by Alexei Maslov.