Chapter three introduces the second plot.Whom does it revolve around?

In Chapter Three, the themes are reformulated. No longer, for the moment, is the book about the trials of solitude. Rather, it becomes an account of the problems of society. The story becomes as much about the Casses as about Silas. The Casses, in status and privilege, could not be more different than Silas. Yet the social life of Lantern Yard is refigured in the life of the Casses; this social life, too, can create alienation, perpetuate ignorance, and lead to a decline in moral values.