A Story About a Simple Thing(1975)

Original title: Рассказ о простой вещи

In order to carry out subversive work, the Chekist remains in a city occupied by whites. To do this, he moves into the doctor's apartment a singer, a graduate of the conservatory, who was joyfully welcomed by the doctor's family, and then, after the arrival of the whites, introduces himself as the husband of this singer, a businessman Couturier.