In 1921, the Cheka became aware that gold and jewelry were stolen from the treasury of Gokhran, and that a special organization was involved in transporting the stolen to Estonia. Scout Maksim Isayev is sent to this country. He establishes that the cipher of the Soviet embassy Olenetskaya works for the German resident Nolmar, with whom employees of Gokhran Kozlovskaya and an appraiser Yakov Shelekhes are associated. As a result of the provocation, Isayev was arrested. In the prison cell, he finds himself together with the famous Russian writer Nikandrov, who could not find himself in post-revolutionary Russia and went abroad. Released soon by the efforts of his comrades, Isayev continues the struggle for the fate of Nikandrov — for his return to his homeland.
Alexei Ivanovich Tyutyurin, a very kind and gentle man by nature, has been working as a hairdresser for twenty years. When the opportunity arises to upgrade to the head of the hall, he is faced with a problem — in the team he has a reputation as a constantly late person and an incorrigible liar.
But Alexei doesn't deceive anyone — he really gets into unusual situations on the way to work. No one believes in these fables until amazing visitors begin to come to the hairdresser.
After Tulyev's arrest, Soviet counterintelligence continues the radio game with the enemy, sending encryptions signed "Nadezhda" to the Western intelligence center. KGB officer Sinitsyn, friendly towards Tulyev, tries to persuade him to take his side — he arranges a meeting to a scout with Mariya and her son, whom he has never seen before. In addition, Mikhail learns that his father didn't die of his own death, but was most likely killed. Meanwhile, a young Soviet scientist Borkov, who spoke at an international conference about his innovative work, finds himself in the spotlight of the Western security services.
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.
