Sebastian Ivanovich Bakhov is a violin teacher at the Gnessin School. He is also a great leader, a great comedian, a great racer and fighter. In any case, this is how he sees himself in his fantasies. However, the measured course of the teacher's life is interrupted by a talented and beautiful first-year student Katya, who came to the city from the province. Gradually, a touching friendship and full mutual understanding arises between the student and the teacher, a sincere, bright and subtle feeling is born. In his fantasies, Bakhov, under various guises, constantly saves Katya from the attacks of desperate robbers, but in reality he becomes a Teacher for Katya with a capital letter and makes her a master...