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.

Grisha Utochkin once told the guys that his nondescript-looking dog, Palma, knows how to catch criminals. And Grisha had to urgently teach her all sorts of dog tricks. But Palma did not want to run on a log, jump over barriers, and even more so follow the "face" command. The training finale was unexpected!

Pre-Petrine Russia, Semyon Lazarev, one of the instigators of the “Copper Riot”, is forced to flee, as a result of which he ends up in the army of the leader of the peasant uprising Stepan Razin.