On New Year's Eve, the 34-year-old physicist-astronomer Ignat Halley, fascinated by the stars and working in a mountain observatory, flies to the capital to divorce. In Moscow, under unusual circumstances, Ignat meets a mysterious young woman Taisia Artemyev and meets her whole family: mother Yulia, sister Dusya and intelligent and eccentric grandmother Yanga Lvovna. This meeting turns everything in the life of the astronomer upside down. And on New Year's Eve, Ignat will have to make an important decision that will change not only his life, but also his new relationships.