Greenmantle is a thrilling espionage novel by John Buchan, published in 1916. Set during World War I, it follows Richard Hannay, a British officer recruited for a perilous secret mission. Hannay must unravel a mysterious German plot threatening the Allied cause in the Middle East. Accompanied by his companions Sandy Arbuthnot, John S. Blenkiron, and Peter Pienaar, he journeys through war-torn Europe and Ottoman Turkey, facing danger at every turn. Their quest reveals a German scheme to ignite a holy war against Britain, orchestrated behind an enigmatic prophet known as "Greenmantle." Combining adventure, suspense, and vivid travel, it remains a classic of spy fiction.
