In the future, people have made enormous progress, they have become able to travel interstellarly, colonize planets... but they are still not omnipotent. Acting primarily in the interests of science, Chron, one of the “12” comrades-in-arms of the world government who once saved humanity, was unable to overcome personal tragedy and mental anguish. For more than a thousand years, he did not give up trying to bring back the dead person. Having found the frozen body of a girl in the Permafrost, she is hastily sent to the Gagarin spaceship. On board, Ekaterina is greeted by Sergei... the long-awaited joy does not happen, Katya is not the one whom the cosmonaut expected to meet again “for all eternity.” Another collapse of hope or the first real chance to achieve what he had failed to do for twelve centuries? On the way to a terraformed Mars, populated by cloned Neanderthals, Chron becomes more acquainted with his companion: Raskova strongly resembles his fiancee who died in the last millennium.