The film tells about the days of Polish culture in the USSR, dedicated to the 30th anniversary of the Polish People's Republic. Performance of the ensemble "Mazovia" in the Tchaikovsky Concert Hall in Moscow. Minister of Culture of the USSR E. A. Furtseva among Polish artists at the Palace of Congresses. A scene from the play "King Mateusz I" (synchronously). Speech by the singer M. Radovich (synchronously). Sale of gramophone records with Jerzy Polomski's recordings. Speech by E. Polomsky (synchronously). The building of the cinema "Krakow" in Kiev. Meeting of Polish actors with the audience before the screening of the feature film "Dark River" in the Moscow cinema "Mir". Among those present at the premiere - the Ambassador of Poland to the USSR B. Pavlenok. Performance by the Warsaw State Philharmonic Orchestra; V. Rovitsky conducts (synchronously); spectators in the hall. Exhibition of masterpieces of Polish painting in the Central Exhibition Hall of the Manege. Speech by the singer A. German (synchronously). An interview with conductor V. Rovitsky before leaving (synchronously). Views of the cities of Yerevan, Odessa, Leningrad, Tallinn, Tbilisi, Donetsk, Vilnius, Riga, in which Polish artists toured. Memorial complex in Khatyn. Speech by the singer I. Santor (synchronously).