It’s hard to refuse when your own parents ask you for moral support! The twins Kisonka and Murka succumbed to their mother’s persuasion to accompany her to the Opera and Ballet Theater, where Marya Alekseevna was supposed to discuss charity performances. But their help was not needed - when she got to the director, the mother immediately forgot about her daughters. The twins decided to take a walk through the theater backstage... And suddenly they witnessed the kidnapping of one of the ballerinas! Kisonka and Murka, of course, helped the girl out... and the White Goose detective agency began a new investigation!