The film is based on a true story. Jakus, managing director of a scooter-factory suddenly resigns, since he disagrees with his superiors in the ministry on several points. Disregarding the attacks of his family and friends, he returns to his original job and becomes a welder, which is not very easy because of his records.

March 15, 1848; the revolution breaks out in the town of Pest. Yet at café Pilvax, in among he revolutionary youth, there is the informer of the imperial court as well. Hearing the news of the attack led by Jellasics, the inhabitants of the villages pour into the national army, and Hajdú Gyurka also escapes from his landlord. Petőfi is there at the camp of the revolutionaries, raising them to enthusiasm with his poetry.