Chang-Rae Lee talks about his new novel, On Such a Full Sea, set in a future, when a long-declining America is strictly stratified by class. Abandoned urban neighborhoods have become high-walled, self-contained labor colonies. The members of the labor class work to provide quality produce and fish to elite villages. In this world lives Fan, a female fish-tank diver, who leaves her home in the B-Mor settlement (once known as Baltimore), when the man she loves mysteriously disappears.