The fourth victim of the siren

Samara, 1890 ... In the bookstores of the city there are mysterious events, ending with deaths of people. What is it? Accidents? Murders? What binds these seemingly completely different in the age and material position of the victim? The suspicion falls on a young woman who suddenly disappears. Police goes on a false trail and clearly does not seek to find a real killer.
And then a lover is starting to investigate ...
In Russian detective, there was no such detective yet.
This hero knows absolutely everything: he is a historical figure.
This hero knows absolutely everything, but many episodes of his life remained unnoticed by even the most zeal and intense researchers.
This hero knows absolutely everything - but not the same as he appears in the notes of the retired follower Nikolai Afanasyevich Ilyin, a witness of mysterious and frightening events.
And only this hero - Vladimir Ulyanov - can answer the classic question of a classic detective: Who is to blame?