The Orion Arm of the Milky Way galaxy is not the longest and most saturated with stars, but it is where the Solar System is located. A thin thread of special communication stations connects the Earth and the most distant expedition of earthlings across hundreds of light years. Planetologist Igor and a group of engineers, who set off from Pluto to the headquarters of the fleet of the 2nd Galactic Expedition, get stuck at an intermediate station. The personnel disappeared, the equipment was broken, the station was looted... At the same time, a monstrous catastrophe occurs in the solar system. The investigation comes to the conclusion that a planetary scientist was involved in it. The intelligence services are in pursuit...