A combination of performances by masters of their arts, this film takes place during the Leningradskoye Leto – the Leningrad "White Nights" annual summer musical festival, featuring music stars, young opera singers, ballet, pop, circus, and amateur artists. Reporters Kostya and Bob are rushing everywhere trying to document the entire festival. Beautiful young singer Svetlana is pursued throughout the festive events by a hopelessly shy police lieutenant, whose unexpected infatuation leaves him unable to speak, but gives him a beautiful baritone voice.