In the Olimpiysky cinema, during a creative meeting with a famous director, an old musician is killed, followed by the death of the administrator. The director of the cinema, the young beauty Diana Arsenyeva, starting her investigation, in some incomprehensible way comes to the discovery of the fatal secret of the most mysterious and talented composer in the entire history of mankind - Wolfgang Amadeus Mozart - and falls into the field of view of a mysterious stranger who attracts her in the same way. as frightening as it is... Who is this incognito and how is all this connected with the greatest musician of all time?..