Earthlings came into contact with an alien race and unexpectedly found out that the galactic community had not used spaceships for a long time. A huge number of inhabited and uninhabited worlds are interconnected by a corridor network. Transitions that made it possible to travel hundreds and thousands of light years stretched to all corners of known space, forming a large-scale transport system. And then genetically modified conductors appeared. Those who have absorbed the endlessly complex map of star corridors. Those who sense worlds suitable for humans and avoid deadly ones.