The action takes place in the 1920s during a plague epidemic in Mongolia. A young Russian woman, Dr. Lyubov Soboleva, at the risk of her life, saves an orphaned child from death. Soboleva fought the plague for many years. Colleagues died, but she stayed alive. Not because she spared herself, but simply because fate had it her way. The plague appeared in Soboleva's life in 1914. A nurse, she found herself on the front lines in the Caucasus, in a group that vaccinated against the plague. One day, a telegram called Soboleva home and a friend replaced her. The latter was infected and died. From that moment on, the plague became Soboleva's personal enemy. And she did not shy away from the fight.
