The film covers the heroic defence of the Brest Fortress, which was attacked during the first strike of German invaders on June 22 1941. The story describes the events of the first days of the defence, including the three main resistance zones, headed by the regiment commander, Pyotr Mikhailovich Gavrilov, the commissar Efim Moiseevich Fomin and the head of the 9th frontier outpost, Andrey Mitrofanovich Kizhevatov. Many years later veteran Alexander Akimov again recalls the memories of the time, when he, then a 15 year old Sasha Akimov was deeply in love with the beautiful Anya and suddenly found himself in the middle of the bloody events of war.

Nikita and Anna have been married for a long time. Nikita is a well-known detective writer, Anna is a business analyst. They are returning by train from the anniversary celebration of a distant relative. Anna is upset that she was unable to buy tickets for the SV, so they have to travel in a regular compartment car. But their long journey is brightened by their neighbors in the compartment—Alevtina and her little daughter Marusya, who are heading to Moscow. The charming Marusya eagerly chats with her fellow travelers. When they wake up in the morning, the couple goes to the restaurant for breakfast, and when they return, they find the child sleeping alone. The girl's mother has disappeared...

The son of urban intellectuals and the daughter of city “former villagers” have filed an application at the registry office to get married. The parents of the young couple are happy. While the wedding preparations are underway and the apartment is being renovated, the future in-laws decide to spend some time together at the summer house to “get used to each other” and get to know one another better. However, living under one roof turns out to be far less pleasant than it seemed. Every day, conflicts flare up between the in-laws over seemingly trivial matters. No sooner is one argument settled than another begins. Yet true love ultimately reconciles these “very different people.” Both families want their children to be happy — just each in their own way. And in the end, harmony finally descends upon the feuding households.