Count Averin. Sorcerer of the Russian Empire

Magical Petersburg, 1982.
Count Averin investigates the murder of a nobleman's son, in which divs, cruel magical beings from the Wasteland, are accused. They obey humans but go out of control at the scent of blood or weakness from their master.
Averin realizes that this is not the first murder, and a very powerful div is behind the crimes. At the same time, a huge demonic cat appears on Petrogradskaya.