In this thrilling adventure, Richard Hannay the star of The Thirty-Nine Steps and Greenmantle, returns to continue his personal battle against the enemies of Great Britain during the Great War. The war on the continent is raging. The German hordes are pushing the allies back into their trenches, the line is barely holding, and it's at this moment that Richard find himself pulled out of the lines for special duty.
Going against everything Hannay believes in, he finds himself working undercover infiltrating a pacifist organisation.
This group is not all it seems to be, as behind the pacifist masks there are German spies and saboteurs.