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.