A new young teacher appears at the Nemukhin Music School. Of course, this is not an ordinary teacher, but the Fairy of Music, and each sound for her has not only its own tonality, but also its own color. In the evenings, Varvara Andreevna conducts an invisible orchestra, but no one hears this music except herself. The fame of the young teacher spread throughout the city and aroused the envy of the Director of the Music School. Faithful friends - Tanya Zabotkina and Petya Vorobyov, help the teacher cope with the machinations of the envious Director.