The revolution in the solar system failed. The army of militants of Mongke Chinggisen - the Mentor - was discovered with the help of the Invisibles unit and destroyed, and he himself fled from Earth. Captain Crassus is ordered to immediately go in search of the Mentor, who seeks to create an invincible army of “star nomads” in the depths of space and, returning with it, to capture the Earth.

The Mentor and his followers serve the race of Luuns, great scientists from the center of the galaxy , who created the military power of the Abrog empire, but started their own game. Earthling intelligence learns that a military rebellion has begun in the core of the galaxy, threatening to escalate into a full-scale war for supreme power in the Abrog empire.

Following their goal, the “Invisibles” are sent into the thick of things. But earthlings do not even suspect that they hold the secret threads of a global war in their hands.