6Chapter Six In the Trenches before Liège
58Chapter Seven Reveals a Plot
7Chapter Seven In the Eagle’s Claws
59Chapter Eight Some Suspicions
8Chapter Eight The Double Face
60Chapter Nine Contains More Curious Facts
9Chapter Nine The Kaiser’s Secret Agent
61Chapter Ten The Tunnel Mystery
10Chapter Ten The Hôtel de L’Épée
62Chapter Eleven The Signalman’s Story
11Chapter Eleven This Word of the Uhlan
63Chapter Twelve Reveals an Astounding Fact
12Chapter Twelve The Fugitives
64Chapter Thirteen The Leopard’s Eyes
13Chapter Thirteen Before the Storm
65Chapter Fourteen False or True?
14Chapter Fourteen Held by the Enemy
66Chapter Fifteen Concerns Harold Hale
15Chapter Fifteen Betrays the Traitor
67Chapter Sixteen At Holly Farm
16Chapter Sixteen The Fire of Fate
68Chapter Seventeen Not Counting the Cost
17Chapter Seventeen In Deadly Peril
69Chapter Eighteen The Tri-Coloured Rings
18Chapter Eighteen The Gulf of Shadows
70Chapter Nineteen Flashes in the Night
19Chapter One The Man of the Moment
71Chapter Twenty Those “Eyes!”
20Chapter Two The Suspicions of Elise
72Chapter Twenty One Roseye’s Secret
21Chapter Three The House in Wimpole Street
73Chapter Twenty Two More Devil’s Work
22Chapter Four His Dying Words
74Chapter Twenty Three The “L39”
23Chapter Five Certain Curious Facts
75Preface About Gerry Sant
24Chapter Six Reveals the Victim
76Chapter One Espionage in Piccadilly
25Chapter Seven The Spider’s Web
77Chapter Two Spying on Spies
26Chapter Eight Toilers of the North Sea
78Chapter Three Berlin’s Secret Code
27Chapter Nine To “Number 70 Berlin”
79Chapter Four The Hidden Hand in Britain
28Chapter Ten The Khaki Cult
80Chapter Five The Perfumed Card
29Chapter Eleven The Enemy’s Cipher
81Chapter Six In the “Personal” Column
30Chapter Twelve On Thin Ice
82Chapter Seven The Elusive Van Rosen
31Chapter Thirteen Towards the Brink
83Chapter Eight “One of the Naturalised”
32Chapter Fourteen Held by the Enemy
84Chapter Nine The Secret of the Perfume
33Chapter Fifteen The Working of “Number 70”
85Chapter Ten The Mystery of Blind Heinrich
34Chapter Sixteen The Catspaw
86Chapter Eleven An Air Raid on London
35Chapter Seventeen The Super-Spy
87Chapter Twelve The Secret of the Ribbon
36Chapter Eighteen Tom Small Receives Visitors
88Chapter Thirteen How Berlin Obtains Information
37Chapter Nineteen Days of Darkness
89Chapter Fourteen The Great Submarine Plot
38Chapter Twenty Told at Dawn
90Chapter Fifteen The Real Mr Engström
39Foreword
91Chapter Sixteen In a Tight Corner
40Chapter One The Rift in the Clouds
92Chapter Seventeen “The Plot Revealed”
41Chapter Two Our Invincible Navy
93Chapter Eighteen The Mysterious Cylinders
42Chapter Three The Coming Victory on Land
94Chapter Nineteen Spy’s Letter Deciphered
43Chapter Four Our Mastery of the Air
95Chapter Twenty A Message from the Herrengasse
44Chapter Five Britain’s Unshakable Resolve
96Chapter Twenty One The Admiral’s Secret
45Chapter Six The Terror in Germany
97The Bomb-Makers
46Chapter Seven Germany’s Bankrupt Future
98The Devil’s Dice
47Chapter Eight The Invisible Hand
99The Great Tunnel Plot
48Chapter Nine Compulsory Service Britain’s Master-Stroke
100The Hyde Park Plot
49Chapter Ten Germany’s Colossal Blunders
101The Explosive Needle
50Chapter Eleven Victory with Honour
102The Brass Triangle
51Chapter Twelve “Never Again”
103The Silent Death
52Chapter One Over a “Gasper”
