Europe is closely following the invasion of the Mongols, who have come close to Bulgaria, and the Russian princes are waging a bloody struggle for the possession of Kiev, mired in civil strife. A young guy and his girlfriend find themselves in a mysterious fog and find themselves far in the past, on the very eve of Batu’s invasion. How their fate will turn out depends not only on them, but on many accidents, which sometimes dramatically change the fate of a person and a country.