There are several scientific problems that are interesting not only to a narrow circle of specialists, but have been exciting the minds of ordinary people for decades. What have dinosaurs died out of? Is there life on Mars? Are there intelligent races in the universe? Is it possible to create a time machine, and if possible, will travel to the past affect the course of history? Two paleontologists in a time machine arrive at the very end of the Mesozoic era in order to find out once and for all what killed the dinosaurs, and discover that everything here is not at all as expected, and the dinosaurs behave very strangely. They only have three days to find out the reasons.