2737 - humanity has mastered dozens of star systems, learning to move at speeds thousands of times faster than the speed of light. The sun is cooling, the Earth has become uninhabitable, and humans have built the space metropolis of Galilee in orbit, home to over 12 million people. There are only wild tribes left on Earth, living deep underground. Egor Astakhov is in his last year of school for specialists of the Energy Security Service in Galilee. He will have to carry out an important assignment from the leadership on the distant planet Tiberon-16: to conclude a deal for the supply of universal fuel. The owner of the deposit, Daggs, needs something completely different - codes to turn off the Galilee energy shield, they are known to Astakhov due to his affiliation with the Service. Daggs is ready to bribe, blackmail and even murder to get what he wants. Getting into terrible troubles, Yegor meets a Chinese man named Wei, who helps him escape from the planet and tells him about the rebels fighting against the Government. Returning home, Astakhov tries to figure out what he learned on Tiberon. After hacking into secret files, he realizes that something terrible is happening and faces a difficult choice.