Rivers. There is no fear

They emerged from human tears and blood, seeping through the soil and merging into underground rivers. They formed bodies resembling humans and stole foreign faces. They have always existed in the nights of Petersburg — feeding on blood, fear, and dark magic. In the twenty-first century, in the dark alleys of Petersburg, they encountered former policeman Igor Grom, who, unlike many others, did not avert his gaze and did not succumb to fear. 
But one hundred and fifty years before this happened, another rather terrifying story emerged about those known as the Underground Rivers...