In 2000, the FBI received a credible threat that a U.S. government agent was close to a deal to sell a huge cache of military secrets to Libya. Special Agent Steven Carr was assigned the task of tracking down the suspect, and Yudhijit Bhattacharjee joins us tell the story of how Carr eventually identified the traitor. Bhattacharjee’s book is called “The Spy Who Couldn’t Spell: A Dyslexic Traitor, an Unbreakable Code, and the FBI’s Hunt for America’s Stolen Secrets” (NAL).