PART I
CHAPTER I The Wicket-Gate
CHAPTER II “The Village Named Morality”
CHAPTER III The Reflections of a Cured Dyspeptic
CHAPTER IV Andrew Amos
CHAPTER V Various Doings in the West
CHAPTER VI The Skirts of the Coolin
CHAPTER VII I Hear of the Wild Birds
CHAPTER VIII The Adventures of a Bagman
CHAPTER IX I Take the Wings of a Dove
CHAPTER X The Advantages of an Air Raid
CHAPTER XI The Valley of Humiliation

PART II
CHAPTER XII I Become a Combatant Once More
CHAPTER XIII The Adventure of the Picardy Château
CHAPTER XIV Mr Blenkiron Discourses on Love and War
CHAPTER XV St Anton
CHAPTER XVI I Lie on a Hard Bed
CHAPTER XVII The Col of the Swallows
CHAPTER XVIII The Underground Railway
CHAPTER XIX The Cage of the Wild Birds
CHAPTER XX The Storm Breaks in the West
CHAPTER XXI How an Exile Returned to His Own People
CHAPTER XXII The Summons Comes for Mr Standfast

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.