Authors Colson Whitehead and Marlon James talk to Nam Kiwanuka about their latest novels, and why they write stories rooted in Black history. Whitehead is the author of the Pulitzer Prize-winning novel "The Underground Railroad." His latest book is "The Nickel Boys." Marlon James is the author of the Booker Prize-winning novel "A Brief History of Seven Killings,; his latest novel is ,Black Leopard, Red Wolf."