Pianist Natalia is a strange amateur detective. Got a difficult case? She sits down at the piano. Playing. And the solution to the crime comes as if by itself. But now Natalia herself is in trouble. She was kidnapped and taken to a mysterious house somewhere in Europe. The kidnapper, the wealthy Frenchman Guy Dupont, is ready not only to provide her with luxury and comfort, but also to pay a lot of money... in exchange for help in investigating the mysterious theft that happened at his party. Why wasn’t she asked to take on this case of her own free will? Why did they stage a strange comedy with a kidnapping? Natalia understands that Dupont is lying to her. But what does he really want?