Several major robberies take place in Leningrad and the region, but the criminal leaves no trace. The Inurkollegia announces that the administrator of the boarding house "Otdykh" Balyasin unexpectedly receives a large sum of money as an inheritance, and the police decide to set a trap for the criminal, believing that he will not pass by such money. An employee of the Criminal Investigation Department arrives at the boarding house, and it soon becomes clear that the elusive criminal is one of the vacationers at the boarding house.
By chance, two middle-aged people met - the telephone operator of the hotel Lina and the chief engineer of the construction department Kirillov, who had arrived on official business from Leningrad in one of the provincial cities of the country. Behind everyone has setbacks in family life. A sincere feeling that brought two lonely people closer together helped to see those around them in a new way. They are already over forty. Both are lonely. Having met by chance and fell in love with each other, they never became happy.
About the peaceful everyday life of one of the tank regiments of the Soviet Army on the northern borders of the country, where graduates of the tank school, Lieutenant Sorokin and his comrades, serve. The acute conflict situation among the officers of the tank regiment reveals people who understand their duty as defenders of the Fatherland in different ways.
Among the greenery of the parks of St. Petersburg, the white dress of a beautiful stranger flashes. Together with the prototype of the poet, and other characters - visitors to the restaurant - we wander around the city, go to restaurants, to the train station, to a reception in a rich and noble house. And everywhere we meet her. A stranger.
