| CHAPTER | | PAGE |
| I | What the Newspaper Told |
9 |
| II | In the Offices of the New York Herald |
17 |
| III | Someone Tries to Buy the “Flyer” |
27 |
| IV | Getting the “Flyer” Ready |
33 |
| V | Buck Stewart—and a Warning |
46 |
| VI | Escaping From Deadly Shadows |
54 |
| VII | What Happened to Ned |
62 |
| VIII | Six Miles Up in the Air |
70 |
| IX | Paris Proves Unfriendly |
78 |
| X | An Adventure in the Ardennes |
86 |
| XI | The Fight in the Forest |
95 |
| XII | Buck Takes His Life in His Hands |
100 |
| XIII | “To Be Shot at Sunrise” |
107 |
| XIV | The Rescue |
115 |
| XV | In Deadly Peril |
124 |
| XVI | Ned Saves the “Flyer’s” Crew |
129 |
| XVII | Bob Russell’s Story |
134 |
| XVIII | How Bob Was Captured as a Spy |
142 |
| XIX | A Strange Country |
149 |
| XX | A Fight With Wild Cossacks in Poland |
157 |
| XXI | Inside of Besieged Przemysl |
165 |
| XXII | The Boys Perform an Act of Mercy |
173 |
| XXIII | Strange Sights in Vienna |
182 |
| XXIV | On the Trail of the Conspirators |
191 |
| XXV | The Boys Get Worried Over Ned |
199 |
| XXVI | An Attempt to Assassinate the Emperor |
209 |
| XXVII | The Man in the Cloak Surprises Everybody |
216 |
| XXVIII | Surrounded by German Zeppelins |
225 |
| XXIX | The Battle Above the Clouds |
230 |
| XXX | The Most Terrible Accident of All |
236 |
| XXXI | The End of the “Ocean Flyer” |
244 |