A young scientist dies of an overdose of a heart drug added to his coffee. Investigators go down the wrong path until they find out that shortly before his death, a scientist proved the fallacy of the scientific theory of a famous professor.

In the midst of a trading day, a young Chinese woman, Annie Denisova, was killed at the market. From a conversation with her husband, Loginov and Petrovskaya learned that in early childhood, in front of Annie's eyes, her father was brutally murdered. And witnesses in the market told investigators that before she died, the girl noticed someone and even chased after this person. A version appears that Annie recognized the murderer ... All the threads lead to the house where the Chinese Shu, who is engaged in the manufacture of fake certificates for the import of art objects from China, rents a room ...