Richard Hannay is tasked to investigate rumours of an uprising in the Muslim world. He takes off on a hair-raising journey through German-occupied Europe to meet up with his old friend Sandy Arbuthnot in Constantinople. There they must thwart the Germans' plans to use religion to help them win the war. Set during World War I, Greenmantle is a powerful meditation on the power of political Islam (it was pulled from Radio 4's schedule at the time of the 7 July bombings).