Journalist and author Yudhijit Bhattacharjee joins us to discuss his book, The Spy Who Couldn't Spell: A Dyslexic Traitor, an Unbreakable Code, and the FBI's Hunt for America's Stolen Secrets. It tells the story of a Brian Regan, an Air Force security specialist, who tried to sell classified intelligence to Libya in 2000 through a series of coded letters. Bhattacharjee details how the F.B.I.'s attempted to break Regan’s code, which was complicated by the fact that he was dyslexia.