Mr. Standfast

Recalled from duty on the Western Front by renowned spymaster Sir Walter Bullivant, British secret agent Richard Hannay goes undercover as a pacifist, working to outwit a dangerous German spy and his agents. Guided by his contact-and love interest-Mary Lamington, Hannay tracks his enemy from London to Glasgow to the Scottish Highlands, eventually confronting him in a dramatic climax above the battlefields of Europe.
Revisiting the memorable characters from The Thirty-Nine Steps, Mr. Standfast is one of two Richard Hannay novels set during the First World War. The Thirty-Nine Steps and its four sequels established John Buchan as an original thriller writer, and a pioneer of espionage fiction.