For two months a serial killer has been terrorizing the city of St. Petersburg. Every Wednesday a girl between 9 and 12 years old is the victim. The brutality of the maniac plunges city residents into horror. Parents are afraid of leaving their children alone on the street. The press reinforces the atmosphere of fear and hysteria.

St. Petersburg. Friends Lera, Valya, and Olya perform a mystical ritual for fun, and suddenly Catherine the Great herself materializes in the kitchen amidst the candles. The crowned empress quickly embraces the 21st century: she tries cappuccino, searches for the "Kareta" fare on a taxi app, and that night, she discovers a dance floor with a bang. The friends are delighted, until they notice that reality around them is beginning to shift.