A young engineer Dmitriy Zherekhov who came to the aircraft plant is trying to prove to the director that it is necessary to switch to new methods of organizing production. He is supported by both experienced test engineer Aleksei Sedykh and test engineer Lyudmila Rudneva. Lyudmila likes Dmitriy, but his rigidity and rationalism complicate their relationship...
During World War II, the Frenchman Léon Garros and Boris Vaganov escape from the Nazi concentration camp. After 15 years, Léon, who became a journalist, and his friends came to the USSR to make a report and find Boris in the meantime. In Moscow he doesn't found, and for the sake of meeting with a friend, Garros has to travel around the country by car...
The foreigners are accompanied by Nikolai, the translator, who, in turn, is looking for his brother's runaway bride, Natasha.
After graduating from the Faculty of Geology, Vasiliy Ruban goes to Transcarpathia, where he will take part in a prospecting expedition, the object of which is oil fields. A business trip of a young man turns into a quarrel with his girlfriend, who dreams of a graduate school in the capital. Despite the assurance of an experienced engineer in the absence of oil deposits, Vasiliy continues his search, which turns into an unexpected discovery of oily spots in the waters of the river. At the same time, the geologist meets Kseniya, a local girl who has won the heart of a man.
