How to spend an interesting and fun evening after a working day? Go to a secret meeting with a black mass. It all starts out seemingly innocently. Elvira invites her best friend Marusya to take a ride out of town to take part in the performance. For her, these gatherings of people in dark clothes are just entertainment. But everything turns out to be not so harmless when a knife appears in the hands of one of them. And the friends have to quickly leave this strange place. Then they start to scare Elya. What is it really? Just a joke or a calculation? Marusya will figure it all out and save her friend, who loves to get into trouble. Contains obscene language.