When Major Richard Hannay has his recuperation interrupted by a telegram from British Intelligence, his hopes are high for a promotion. However, his orders are not for Europe's battlefields, but for another deadly mission into the core of the enemy's secret plans. Teaming up with his good friend sandy Arbuthnot and the American agent Blenkiron. Hannay is nervous about his assignment - not least because no one can tell him exactly what it is. But as he travels to the heart of the Middle East, Hannay discovers the terrible truth: the Germans have discovered a deadly secret weapon, one that has the power to unleash hell and change the entire course of the war.