Greenmantle (Version 2)

Greenmantle, published in 1916, is the second novel in John Buchan's Richard Hannay series. Set during World War I, it follows Hannay as he investigates rumors of a Muslim uprising and embarks on a dangerous journey through enemy territory to Constantinople. Alongside his friend Sandy, Hannay must thwart German plans to exploit religious tensions to gain an advantage in the war, culminating in the battle of Erzurum. This novel is notable for its blend of adventure and political intrigue during a pivotal historical moment.