| PROLOGUE | PAGE | |
| I | IS MAINLY SCANDALOUS | 7 |
| II | CONCERNS TWO STRANGERS | 18 |
| THE STORY OF OWEN BIDDULPH | ||
| CHAP. | ||
| I | BESIDE STILL WATERS | 35 |
| II | TOLD IN THE NIGHT | 46 |
| III | THE CLERGYMAN FROM HAMPSHIRE | 58 |
| IV | THE PERIL BEYOND | 68 |
| V | THE DARK HOUSE IN BAYSWATER | 79 |
| VI | A GHASTLY TRUTH | 89 |
| VII | THE FLAME OF THE CANDLE | 99 |
| VIII | PRESENTS ANOTHER PROBLEM | 107 |
| IX | FACE TO FACE | 117 |
| X | CONTAINS A FURTHER SURPRISE | 125 |
| XI | WHAT THE POLICE KNEW | 136 |
| XII | THE WORD OF A WOMAN | 145 |
| XIII | THE DEATH KISS | 156 |
| XIV | OF THINGS UNMENTIONABLE | 165 |
| XV | FORBIDDEN LOVE | 175 |
| XVI | THE MAN IN GOLD PINCE-NEZ | 185 |
| XVII | THE MAN IN THE STREET | 196 |
| XVIII | PROOF POSITIVE | 206 |
| XIX | THROUGH THE MISTS | 215 |
| XX | THE STRANGER IN THE RUE DE RIVOLI | 225 |
| XXI | DESCRIBES AN UNWELCOME VISIT | 234 |
| XXII | MORE MYSTERY | 242 |
| XXIII | IN FULL CRY | 253 |
| XXIV | AN UNFORTUNATE SLIP | 263 |
| XXV | MORE STRANGE FACTS | 272 |
| XXVI | “SOME SENSATIONAL REVELATIONS” | 281 |
| XXVII | A CONTRETEMPS | 291 |
| XXVIII | THE FRENCHMAN MAKES A STATEMENT | 298 |
| XXIX | FURTHER REVELATIONS | 307 |
| XXX | CONCLUSION | 313 |
| CHAPTER | PAGE | |
| I. | —IS MAINLY MYSTERIOUS | 7 |
| II. | —CONCERNS A PRETTY STRANGER | 19 |
| III. | —DESCRIBES TWO INQUIRIES | 34 |
| IV. | —DESCRIBES A TORN CARD | 45 |
| V. | —SECRETS OF STATE | 56 |
| VI. | —THE SAFE BREAKERS | 67 |
| VII. | —THE DOWNWARD PATH | 78 |
| VIII. | —REVEALS THE GRIM TRUTH | 88 |
| IX. | —IN THE NIGHT | 99 |
| X. | —HONOUR AMONG THIEVES | 108 |
| XI. | —THE VOW | 119 |
| XII. | —THE FATE OF “THE AMERICAN” | 130 |
| XIII. | —SISTERS IN SILENCE | 139 |
| XIV. | —JEAN LEARNS THE TRUTH | 149 |
| XV. | —HIS LORDSHIP’S VISITOR | 159 |
| XVI. | —JEAN HAS A SURPRISE | 169 |
| XVII. | —THE DARKENING HORIZON | 178 |
| XVIII. | —LORD BRACONDALE’S CONFESSION | 188 |
| XIX. | —THE GARDEN OF LOVE | 197 |
| XX. | —CROOKED CONFIDENCES | 206 |
| XXI. | —THE GREEN TABLE | 215 |
| XXII. | —DISCLOSES A SCHEME | 224 |
| XXIII. | —THE FALLING SHADOW | 235 |
| XXIV. | —THE BLOW | 244 |
| XXV. | —TO PAY THE PRICE | 255 |
| XXVI. | —A CHILD’S QUESTION | 265 |
| XXVII. | —THE INTRUDER | 275 |
| XXVIII. | —THE CLOSED BOX | 284 |
| XXIX. | —DEADLY PERIL | 293 |
| XXX. | —THE WHITE LIE | 299 |
| CHAPTER | PAGE | |
| I.— | INTRODUCES A GENTLEMAN | 7 |
| II.— | THE SCENT | 20 |
| III.— | DESCRIBES THE TRYSTING-PLACE | 35 |
| IV.— | "DEAR OLD DIG" | 45 |
| V.— | "TIME WILL PROVE" | 54 |
| VI.— | THE PIECE OF CONVICTION | 63 |
| VII.— | FATAL FINGERS | 71 |
| VIII.— | CONTAINS FURTHER EVIDENCE | 80 |
| IX.— | DESCRIBES THE YELLOW SIGN | 89 |
| X.— | CHERCHEZ LA FEMME | 97 |
| XI.— | IN WHICH AN ALLEGATION IS MADE | 108 |
| XII.— | PHRIDA MAKES CONFESSION | 117 |
| XIII.— | THE FUGITIVE'S SECRET | 126 |
| XIV.— | REVEALS A FURTHER DECEPTION | 136 |
| XV.— | AN EFFACED IDENTITY | 144 |
| XVI.— | REVEALS ANOTHER ENIGMA | 153 |
| XVII.— | CONCERNS MRS. PETRE | 162 |
| XVIII.— | DISCLOSES THE TRAP | 170 |
| XIX.— | THE SEAL OF SILENCE | 179 |
| XX.— | FROM THE TOMB | 187 |
| XXI.— | RECORDS A STRANGE STATEMENT | 195 |
| XXII.— | "MARIE BRACQ!" | 203 |
| XXIII.— | LOVE'S CONFESSION | 213 |
| XXIV.— | OFFICIAL SECRECY | 222 |
| XXV.— | FRÉMY, OF THE SURETÉ | 231 |
| XXVI.— | SHOWS EXPERT METHODS | 239 |
| XXVII.— | EDWARDS BECOMES MORE PUZZLED | 248 |
| XXVIII.— | FURTHER ADMISSIONS | 256 |
| XXIX.— | THE SELLER OF SHAWLS | 265 |
| XXX.— | FACE TO FACE | 274 |
| XXXI.— | SHOWS THE TRUTH-TELLER | 284 |
| XXXII.— | IS THE CONCLUSION | 294 |
| CHAP. | PAGE | |
| I. | A MOVE ON THE “FORTY” | 1 |
| II. | A SENTIMENTAL SWINDLE | 21 |
| III. | THE STORY OF A SECRET | 43 |
| IV. | A RUN WITH ROSALIE | 66 |
| V. | THE SIX NEW NOVELS | 86 |
| VI. | THE GENTLEMAN FROM LONDON | 109 |
| VII. | THE LADY OF THE GREAT NORTH ROAD | 132 |
| VIII. | THE RED ROOSTER | 154 |
| IX. | CONCERNING THE OTHER FELLOW | 177 |
| X. | THE LADY IN A HURRY | 200 |
| XI. | THE PERIL OF PIERRETTE | 222 |
| IF ENGLAND KNEW | |
| THE PERIL OF ENGLAND | |
| CHAPTER I | HOW THE PLANS OF ROSYTH WERE STOLEN |
| CHAPTER II | THE SECRET OF THE SILENT SUBMARINE |
| CHAPTER III | THE BACK-DOOR OF ENGLAND |
| CHAPTER IV | HOW THE GERMANS ARE PREPARING FOR INVASION |
| CHAPTER V | THE SECRET OF THE NEW BRITISH AEROPLANE |
| CHAPTER VI | THE SECRET OF THE NEW ARMOUR-PLATES |
| CHAPTER VII | THE SECRET OF THE IMPROVED "DREADNOUGHT" |
| CHAPTER VIII | THE GERMAN PLOT AGAINST ENGLAND |
| CHAPTER IX | THE SECRET OF OUR NEW GUN |
| CHAPTER X | THE SECRET OF THE CLYDE DEFENCES |
| CHAPTER XI | THE PERIL OF LONDON |
| CHAPTER XII | HOW GERMANY FOMENTS STRIFE |
| CHAPTER XIII | OUR WIRELESS SECRETS |
| CHAPTER XIV | PLAYING A DESPERATE GAME |
| Secret Number One | The Tragedy of the Leutenbergs |
| Secret Number Two | The Crown-prince's Revenge |
| Secret Number Three | How The Kaiser Persecuted a Princess |
| Secret Number Four | The Mysterious Frau Kleist |
| Secret Number Five | The Girl Who Knew the Crown-prince's Secret |
| Secret Number Six | The Affair of the Hunchbacked Countess |
| Secret Number Seven | The British Girl Who Baulked the Kaiser |
| Secret Number Eight | How the Crown-prince Was Blackmailed |
| Secret Number Nine | The Crown-prince's Escapade in London |
| Secret Number Ten | How the Kaiser Escaped Assassination |
| Note Added by Count Ernst Von Heltzendorff |