Not far from Moscow there is such a city Nizhny Novgorod. Here, two mighty rivers join together - a great strength. Once there was a passage between the worlds. It can open again. Intelligent homeless people who have become ghouls are sitting in deep catacombs under an old water pump on the banks of the Oka. Mermaids have settled under the Kanavinsky bridge and are luring suicides - they need a lot of servants. Kikimors wander along Bor in search of an accidental traveler, and a nest of ghouls has settled on Molitovka; they want blood and smartphones. Gray shortfalls wander near the Moscow railway station - they need your emotions. To go from that side to this, you need a person who will open the door between the worlds. Providence wanted Valerka Ptitsyn to become such a guide.