They returned to their home planet where, during their interstellar flight, more than a hundred years had passed—and everything had changed so radically that Earth became alien to them. Different houses and other machines, different clothes and food; even nature was unfamiliar. But what about people? Outwardly they looked the same, but something had happened to their souls. It turned out they were now unable to kill—this ability had been taken away from humans on a genetic level. Yet along with aggression, humankind lost something even greater… Does the future exist for this supposedly perfect world?