With the Islamic State of Iraq and al-Sham still on the rampage and at the top of the U.S. national security agenda, we at Foreign Affairs have put together this companion eBook to Endgame in Iraq, in which our authors carefully examine the nature of the ISIS threat, the current state of the war against it, and the options for what to do next.

Bringing together a collection of our best coverage of the subject from both print and Web, The ISIS Crisis offers an unparalleled range of authoritative analysis on everything from the group’s ideology, strategy, and internal characteristics; to its operations across the Middle East and elsewhere; to the difficult tradeoffs involved in trying to halt and reverse its advance. The collection concludes with a fascinating survey of expert opinion on whether Washington should step up its anti-ISIS military campaign, in which 73 of the world’s most knowledgeable observers offer their personal take on the question.

We can’t promise that after reading all this, you’ll know exactly what to do. But we can promise that you’ll have the information you need to think about the question intelligently.