Islam is central to ISIS, says journalist who spent years interviewing fighters

The violent activities of the terrorist organization known as Islamic State, have confounded the world's great powers, and attracted young people from across the globe to its ranks. Yet we know little about who its adherents are, or why they act as they do. For more than a decade, journalist Graeme Wood immersed himself in the world of the Islamic State. His new book is called The Way of The Strangers: Encounters with the Islamic State.