Back in 1942, at the height of the Great Patriotic War, a major plague epidemic broke out in Mongolia. A detachment of Soviet specialists was sent to fight it, who worked selflessly, saving people, burning corpses, testing new methods of administering the vaccine, and also falling in love, getting married and having children. 70 years later, their children, now elderly themselves, set off on a journey to Mongolia, following in the footsteps of their parents.