Sonya works as a psychiatrist in a private clinic, is busy only with her career and subordinates everything in life to iron logic and will. She is pretty, but she is in no hurry to fall in love, much less get married. The wife of the banker Zimin comes to see her and wants to observe her stepson Denis, whose behavior seems inappropriate to her and her husband. Every midnight Denis climbs onto the roof and... sings, and in English. To his complete amazement, the doctor very soon realizes that he cannot resist the inhuman charm of the patient.