Each volume in the Collector`s Library series has a specially commissioned Afterword, brief biography of the author and a further reading list. The Afterword for this edition of is by Ned Halley. Following his adventures foiling the plans of the Black Stone gang in The Thirty-Nine Steps, Richard Hannay is called in to investigate rumours of an uprising in the Muslim world, and undertakes a perilous journey through enemy territory to meet up with his friend Sandy in Constantinople. Once there, he and his friends must thwart the Germans` plans to use religion to help them win the war, climaxing at the battle of well as being a gripping adventure story, Greenmantle is surprisingly modern in the concept of using a Jihad to mobilise Muslim forces, and is disturbingly relevant to the modern world.