The film is set in Moscow, nowadays. The center of events is the miraculously preserved world of a communal apartment – one of the last in our time. It remains almost the same order as it was decades ago – a corridor filled with things, disputes and sometimes squabbles between neighbors, the eternal dream of a separate apartment or at least an expansion of living space. But this is only at the beginning. With the advent of two new tenants, the relationship of neighbors changes, and the apartment itself becomes not just a communal apartment, but a real detective agency. But, everything is in order.

The year is 1943. Anna Petrova is a combat pilot who was seriously injured. She returned to the rear and works as a leading engineer at an aviation plant, where new Gyrfalcons aircraft are being prepared for testing. The plant's management, unaware of the consequences of her injury, instructs Anna, together with Major Zotov, to drive the prototype of the Gyrfalcon to the front. In addition to the desire to defeat the enemy and return home with a victory, Anna pursues a personal goal. She is determined to get even with Major Briggel, the German pilot who killed her lover.

Marina, once “burned” in matters of the heart, promises herself that she will never get married. And men will... only be “used.” She has a private hotel in the very center of St. Petersburg. With her exceptional beauty, Marina attracts many admirers to the hotel, without giving any of them the slightest hope of reciprocity. But one day, Konstantin Solomatin, a naval officer, captain of the first rank, and... an inveterate misogynist, stops at her hotel. He not only does not have loving feelings for our heroine, but also manages, in a fit of anger, to insult her by hinting that she leads the life of a kept woman. The wounded Marina decides to take revenge on the captain: to make him fall in love with her at all costs, and then make him suffer from unrequited love...