During the siege of Leningrad a Nazi bombshell destroys the storage of an experimental medicine institute where deadly dangerous viruses were kept. Severe winter weather prevents an epidemic from breaking out in the besieged city. But the spring is coming, and Leningrad is on the brink of bacterial catastrophe. Doctor Maritskaya and NKWD officer Andreew have only three days to save the city.

Snow is a form of precipitation of crystalline form, referring to precipitation. For the heroine of the film, the word “snow” has a completely different meaning.

The plot of one of the brightest, mysterious and extraordinary works of the 30th years of the last century "The novel with cocaine" (the author M. Levi, a pseudonym M. Ageev) which has gained really world recognition is the basis for the script of the movie. Between heroes of the novel and movie almost century whether and a lot of things have changed during this time in human essence? This movie how shouldn't be. But from century to century repeats.

A female hunter shot a man who was just flying in the jamb with other men. She gave him shelter and bore him an egg. But he never stopped dreaming of the sky, and when spring came, he finally managed to take off. The woman ran out with a gun, shot, but another man fell down. Hunter took him home and the man had nothing else left but remembering what was irrevocably lost.