MR. STANDFAST (LATTER DAYS OF WORLD WAR I)

Third Book after "The Thirty Nine Steps"
Set in the later years of World War I, Brigadier-General Hannay is recalled from active service on the Western Front to undertake a secret mission hunting for a dangerous German agent at large in Britain. He is forced to work undercover disguised as a pacifist, roaming the country incognito to investigate the deadly spy and his agents, and then heads to the Swiss Alps to save Europe from being overwhelmed by the German army.

Looking for another good bo...