The investigation of a new intricate and complex case brings criminal observer of the GUVD Press Center Ekaterina Petrovskaya and her friend Sergei Meshchersky to the Museum of the Orient. It was there that Afia Badyanova-Asante, who was found murdered on the shore of the lake, worked. And the day before, Alla Polozova jumped from a bridge directly under the wheels of a train. True, the driver claims that there was no suicide, but that the woman was pushed onto the track by an unknown force. These two seemingly dissimilar cases are intertwined into one, the victims of which grow exponentially. All the leads lead to the Museum of the East, where an exhibition of African art is taking place. And the main exhibit - a black head made of ebony with real human teeth - seems to require more and more deaths...