A classic espionage and adventure novel by John Buchan and the second book in the Richard Hannay series, following The Thirty-Nine Steps. Set during World War I, the story follows Richard Hannay as he is recruited for a secret mission across Europe and the Middle East to thwart a German plot aimed at inciting a major uprising against the British Empire.

Filled with intrigue, disguises, daring escapes, and international espionage, the novel combines fast-paced adventure with wartime suspense. It remains one of the most influential spy novels of the early twentieth century.