CONTENTS
| CHAPTER | |
| I | [A SKY RIDE] |
| II | [A NEW IDEA] |
| III | [THE BIG OFFER] |
| IV | [MR. DAMON'S WHIZZER] |
| V | [TOM'S PROJECT] |
| VI | [MAKING PLANS] |
| VII | [A PROBLEM IN SOUND] |
| VIII | [THROUGH THE ROOF] |
| IX | [AFTER A SPY] |
| X | [A BIG SPLASH] |
| XI | [A NIGHT TRIP] |
| XII | [THE CRY FOR HELP] |
| XIII | [SOMETHING QUEER] |
| XIV | [THE TELEPHONE CALL] |
| XV | [A VAIN SEARCH] |
| XVI | [THE LONG NIGHT] |
| XVII | [SILENT SAM] |
| XVIII | [SUSPICIONS] |
| XIX | [ANOTHER FLIGHT] |
| XX | [QUEER MARKS] |
| XXI | [THE DESERTED CABIN] |
| XXII | [CLEWS AT LAST] |
| XXIII | [THE GOVERNMENT TEST] |
| XXIV | [IN THE MOONLIGHT] |
| XXV | [THE GOLD TOOTH] |