Obama will have to face the growing menace of Al Qaeda in the Arabian Peninsula (AQAP) and the failing state in Yemen that it thrives on. The response must be nimble and careful because AQAP’s real goal is to drag America into another bleeding war in the Muslim world, this time hoping it will spread into the oil rich deserts of Saudi Arabia. Luckily, Gregory Johnsen has written the best new book on al Qaeda in 2012 and the best book on Yemen in years.

The Last Refuge: Yemen, Al Qaeda and America’s War in Arabia is a detailed narrative account of the development of AQAP.  It is also a great read; Johnsen is a very good storyteller.  The story is fascinating, this is a group that was virtually destroyed in 2004 by drone attacks and effective counter terrorism operations, and then it recovered, helped immensely by the Arab world’s anger over the American invasion of Iraq. In 2009 it rebranded itself with new leadership composed of Saudis and Yemenis, several of whom had been prisoners in Guantanamo Bay. It’s number two, Saeed al Shihri, spent five years America’s Cuban prison before being released to Saudi Arabia in 2007 where he fled into Yemen. A drone had allegedly killed him last month, then he reappeared alive in a message threatening more attacks on America.

Since 2009 AQAP has tried to attack the American homeland at least three times. On Christmas Day 2009 it almost succeeded. I served as an expert witness to the trial of the suicide terrorist who successfully penetrated American security and got a bomb on a Detroit bound flight that day. President Obama was absolutely right when he said after the fact “we dodged a bullet, but just barely” because the bomb failed to detonate properly. Johnsen reveals that AQAP’s master bomb maker, a Saudi named Ibrahim Asiri has now built a bomb with two detonators so it can’t fail.

The Arab Awakening came to Yemen in 2011 with a vengeance and has left the country completely fragmented. AQAP has thrived. Yemen has always been a difficult and inhospitable place. Its most desolate region, where Osama Ben Laden’s family comes from and Shihri was nearly killed, is the Hadramawt which means “death has come” in Arabic and is said to contain the gate to hell in one of its wadis. Today Yemen is running out of oil and water, more than half the population is under 18, half goes to bed every night hungry and the national government barely controls even parts of the capital.

America’s key ally in this war is Yemen’s bigger and richer brother, Saudi Arabia, the real prize in the struggle.

For over a decade America has been trying to fight al Qaeda in Yemen without getting dragged deeper and deeper into its internal dysfunctional politics. Johnsen’s book provides a gripping account of the American war and its key players. The US ambassadors on the scene are portrayed vividly and their counter terrorism bosses back in Washington. So are the tensions between them over how to deal with AQAP and the complex politics of Yemen.

America’s key ally in this war is Yemen’s bigger and richer brother, Saudi Arabia, the real prize in the struggle. Bin Laden and his protégés in AQAP have always had their focus on the Kingdom and the House of Saud. Johnsen details just how deeply the Saudis have become involved in the war in Yemen including how its intelligence service has foiled two AQAP plots against America and its Royal Saudi Air Force is now flying bombing strikes against AQAP targets deep inside the country.

AQAP entitled the video it produced about the Christmas Day plot “the Final Trap.”  Shihri was one of the narrators. What the title meant was that al Qaeda hopes to draw America deeper and deeper into a quagmire with more and more boots on the ground in Yemen. It wants another Iraq, another Afghanistan. An attack in America that killed hundreds would force America to take on the challenge of rebuilding Yemen with our own hands, a final trap that would bled America’s military, our economy, and our morale.

President Obama has wisely avoided the trap for the last four years but the Yemeni threat has not gone away and the slow collapse of the Yemeni state offers little hope that it will.  Washington has a long-term challenge in Arabia. Greg Johnsen has written an excellent guide to the scary conundrum that we face.