In the rich noble family of Popelski son Peter was blind from birth. Under the influence of his uncle Maksim, who fought in his youth under Garibaldi's banner, Piotr sets off with other blind musicians for a long hike in the country.
15-year-old Alyosha Lowszyn dreams of becoming a high-class tram driver in his kolkhoz and driving machines as efficiently as the head of labor shift, Szugaj. However, the rules do not allow him to work at such a young age.