How does a local militia run by a former criminal become the world's most feared terrorist organisation - a self-proclaimed state able to co-ordinate and inspire deadly attacks in cities and towns around the world? This program reveals the origins of the Islamic State, what they want to achieve, and how their shocking and violent tactics have redefined warfare in the 21st century. Focusing on fateful turning points in history, the documentary looks at America's eight year war in Iraq through the lens of the US policy makers, generals and intelligence officials who were there. They detail the missed opportunities that may have forestalled the rise of ISIS and track its evolving reign of terror through to the currently unfolding operations to roll back ISIS territory. Hear from attack survivors, and in an extraordinary interview, get a rare and unflinching first-hand look at life inside the Caliphate from an unrepentant ISIS fighter who justifies beheadings.