The Mystery of the Dead Rector. Book 1

After a grand and bloody battle, Count Avelin and Kuzya join the service in the Administration. The heroes deserve a rest, but even in their native St. Petersburg, the times are not the calmest, and to top it all off, an accident occurs at the Moscow Witch Academy: the rector dies under strange circumstances, and the most powerful demon is on the loose. But why is Hermes Avelin specifically invited for the investigation? Kuzya and Vladimir also take on the case, but there is no evidence against the main suspect. And what connects him and Vladimir?