The children have decided to discover the sunken city. The children are helped in their search by the gardener Ermile, who has a number of things and paintings in his house that confirm the existence of the sunken city, removed from the bottom of the sea.
Based on the novel of the same name by Fyodor Dostoevsky. A penniless girl marries a pawnbroker. The spouses do not understand each other because of the difference in age and social status.
