Instruments of Darkness. Iron Spike

In the gloomy city of Lovekraft, chatters rule, burning heretics for the most innocent dissent, the gears of the Great Carrier rotate under the thickness of the earth, and in the night abandoned streets roam terrible monsters ...
Aoif Grayson will soon fulfill sixteen, which means that she has every chance of getting dangerous non-nerovirus who have given an inexplicable madness epidemic. The mother of Aoifa has been lying in a crazy house for several years and dreams about Lilia, her brother is considered missing, and she never seen his father. With the approach of the birthday, the girl threatens the deduction from the Academy of Arts and Machines, although it is there it is trying to escape from reality - in the drawings, engineering textbooks and mathematical tables.
But one day a mysterious letter comes to her, in which only one word is written: Help