All coincidences are not accidental

Nina Kornilina receives an invitation from the owners of a Parisian gallery to come and present her husband Arthur Kornilin's work at an exhibition, who died under strange circumstances. Re-reading the artist's diaries, Nina begins to fearfully suspect that Arthur... was developing a mental illness before his death. The "vision of Rosa," as she called the sketch of the future painting "Magic" with a black rose in the center, seemed particularly terrifying to her. Before his death, Nina dreams of the Black Man, who had also pursued her husband. And this is not the last murder. All the crimes are mysteriously connected to the secret of the Florentine medallion, crafted by a famous medieval jeweler and alchemist as a gift for his beloved.