Alisa Seleznyova and her father professor Seleznyov are traveling in space. They meet their old friend archaeologist Gromozeka, who's just discovered a planet all inhabitants of which died. It became known that they discovered a virus of hostility, got infected and killed each other. Gromozeka also discovered that they had left the virus on Earth 26000 years ago, and the virus is about to become loose. The only chance to save the Earth is to travel 26000 years back in time - to the epoch when witches, dragons and magicians lived along with usual people.
Young homeless man Luke is not going to obey the laws established by his homeless colleagues, as well as the arbitrariness of the foreman when he finds himself in forced labor. But only resistance to his own kind does not give Luke anything: without housing and means of subsistence, and, finally, without basic rights to protect the individual, he no longer sees any light in this life.
A detachment of Red Army soldiers is ambushed, from where only the boy can escape.
