Greenmantle (Version 3)
Author: first_name: John
last_name: Buchan
Language: English
Year: 1996

Hannay is called in to investigate rumours of an uprising in the Muslim world and undertakes a perilous journey through enemy territory to meet 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 Erzurum.