The series is about the operation code-named "Trest", which under the leadership of F.E.Dzerzhinsky was carried out by the VChK to identify and eliminate the counter-revolutionary and monarchist underground on the territory of the USSR, associated with foreign white-emigrant organizations.
A man from a poor noble family named Aldemaro falls in love with the daughter of a rich gentleman. He comes up with a pseudonym and introduces himself as a dance teacher in order to get into their house.
