District therapist Olga was returning home, thinking about her lonely life. And how can you start an affair if you work in a clinic and live in a communal apartment?.. While going up the stairs, Olga looked into the slightly open door of the apartment on the floor below and found an unknown woman there who urgently needed a doctor! Before the ambulance took her away, the stranger managed to say only one word: “Vampires!” And soon the residents of Olga’s apartment found the corpse of a man in a vampire mask in front of their door. What kind of cruel and dangerous games are these? Olga and her neighbors began to figure out who was disturbing the peace of their modest home. The girl had no idea yet: this investigation would lead her to a meeting with fate...