O. K. Rynkov, a teacher of the 509th Moscow school, and students of the graduating class, who decided to leave for Siberia after graduation for a large construction project. Students read letters sent in support of their decision. Departure fees for leaving families. Seeing off young people leaving for Siberia on the platform of the station. Young people in the train carriage. Meeting the young people who arrived at the station of Biysk (Altai Territory). Dorm rooms in which the newly arrived Muscovites live. School graduates work on the construction of residential buildings in the city of Biysk. Komsomol meeting of builders; discussion of the issue of violation of labor discipline by two girls, members of the construction team. Rest of the builders after the end of the working day: playing volleyball, watching television, walking, dancing.