After the death of Konstantin Crusaders, an oppressive atmosphere prevails in the department that he headed. Moreover, they plan to appoint the "eternal duty officer" Anton Shchetkin as the head of the group, who is beginning to be persistently interested in the materials on Faust collected by Krestonosev. The situation in the department is being changed by a new task assigned to Morozov and Masha. A manhole with an ominous inscription is found in the building of an ancient manufactory. And, as it soon turns out, these words will turn out to be prophetic...

An ordinary walk through the city at night turns into a tragedy for a couple of Petersburgers: a young man is picked up by a black, black car. And this is not the only incident that exactly reproduces the plot of a children's horror story. The Crusaders will once again have to deal with a series of mystical crimes. As for the development of Faust, Konstantin decides to delve into archival affairs in order to find clues. However, this has to be done with great care, because someone in the office is watching his every move...