Graeme Wood sits down with Atlantic editor in chief James Bennet to discuss "What ISIS Really Wants," his groundbreaking cover story about the ideology behind the Islamic State. In the interview, Wood explains how he reported the story without visiting Iraq or Syria, how he tracked down sources across the globe—such as Musa Cerantonio, an Australian preacher reported to be one of the Islamic State’s most influential recruiters—and how they reacted after reading the story. "I just wanted to find out exactly what [Cerantonio] thought," Wood says. "The things that he wanted to tell the world were the things that I wanted to listen to."