The second novel in the trilogy of the Russian science fiction writer A. Kalugin about the Sphere of Stability moves the beginning of the action to Earth, where an expedition is formed to the seemingly inaccessible Sphere of Stability. Having become part of the expedition, the main character of the novel, Igor Stinov, warns earthlings against a complacent attitude towards the upcoming contact with the inhabitants of this space reservation. And his words begin to come true at the moment the expeditionary shuttles take off...