The film is set in the 1930s in the USSR. The film tells about one day of the construction of the Magnitogorsk Iron and Steel Works. The heroes of the film are simple construction workers who are burning at work. Upon learning that their colleagues in Kharkov have set a record, they mobilize to break it. The entire construction site was engulfed in immense socialist competition. The teams are ready to complete the work on time at any cost. A Moscow journalist who has come to cover the scale of the great construction project is looking for the hero of his report...

Фильм воссоздает ритм жизни одной из ударных строек первых пятилеток, погружая зрителя в атмосферу трудового энтузиазма молодых романтиков-первопроходцев 1930-х, зачинателей советской индустрии.