Julie Burstein fills in for Leonard Lopate. On today’s show: Pulitzer Prize-winning reporter Joby Warrick tells about an al Qaeda mole who infiltrated the CIA. For our Underappreciated series, Ann Beattie looks at David Markson’s 1988 novel Wittgenstein’s Mistress, a book David Foster Wallace called a “work of genius.” Grammy winning jazz trumpeter Terence Blanchard stops by. Plus, former hacker Michael Calce discusses how he brought down sites from Amazon to CNN to Yahoo!