Traces how the strain of militant Islam behind ISIS first arose in a remote Jordanian prison and spread to become the world's greatest threat. This title shows how the zeal of Abu Musab al-Zarqawi and the strategic mistakes of Western governments led to the banner of ISIS being raised over huge swathes of Syria and Iraq.

JOBY WARRICK has been a reporter for The Washington Post since 1996. He is a two-time winner of the Pulitzer Prize, and the author of The Triple Agent.