Who is Zvyeryeva from The Case of Comrade Tulayev and what is their importance?

Zvyeryeva is one of the examiners appointed to follow the most serious leads in the Tulayev case. She has dyed hair and manicured nails. Face massages, creams, and makeup give Zvyeryeva an irritatingly young face of blurred features and indistinct wrinkles. Her eyes are hard and restless. She will use any tactics to get a confession.