The film tells the story of Olga Sergeevna, a renowned oceanographer. Throughout her life, Olga Sergeevna loved only one man, with whom she was never destined to find happiness.

The 1920s. Count Kabardin, who emigrated to France, sends Colonel Lavrov to Russia with the aim of bringing his daughter Irina to Paris. Irina married Chekist Andrei Slavinsky and joined the revolution. Under the guise of a White Guard lieutenant, Andrei is sent to France. He carries out a secret intelligence mission. But Irina believes that her husband has died. The chairman of the Cheka, learning of Lavrov's visit, gives him the opportunity to take Irina to France and gives her a new assignment and a password for Andrei.

The hero of the film, police captain Anatoly Lensky, is an adventurer who is characterized by nobility, a sense of honor and intrigue. Together with other characters goes to the "Bay of death" in search of hidden treasures there. All heroes movie must to meet in one place. There they will converge, but not all come back…

This film musical is a romantic comedy of mistaken identities set at the 10th World Festival in Berlin. Alexej from Moscow meets and is attracted to Mascha, right before he leaves for Berlin. Mascha also travels to Berlin to perform with her cultural ensemble. While there, she boards with the Krüger family, whose son Hans is attracted to her.

In the 18th century, Moldavian land was under the yoke of foreign invaders and the oppression of local boyars. A national liberation struggle unfolded in the country, in which the Hajduk led by Ataman Badiu actively participated. Boyar Manya, with the help of mercenaries, managed to capture him. But the boyar's daughter, who loved Badiu, gathered a detachment of Hajduk, who freed their chieftain.