As a result of a mysterious experiment, Varvara Kononova and Alexey Danilov find themselves in the USSR in 1957. Using his knowledge of the future, Alexey becomes assistant to the First Secretary of the CPSU Central Committee Khrushchev. But the young man does not occupy a high position for long. His stories about the collapse of communism in the 90s drive Khrushchev into a frenzy. Alexei is arrested. At the same time, Colonel Petrenko arrives from the future and tells Varya terrible things: in 2020, a series of epidemics and disasters began in Russia. Petrenko faces a task: to rewrite history. And Varya and Danilov are forced to help him...