| CHAPTER | PAGE |
| I. | THE END OF THE UNDERGROUND RIVER | 1 |
| II. | SKY HIGH | 11 |
| III. | THE RETURN TO THE LAND OF THE INCAS | 24 |
| IV. | THE RIVALRY OF THE AIRMEN | 32 |
| V. | IN QUEST OF THE HIDDEN TREASURE | 43 |
| VI. | THE CROWNING MISFORTUNE | 55 |
| VII. | IN THE TIGER’S LAIR | 66 |
| VIII. | THE INCA’S THREAT | 80 |
| IX. | SONCCO’S SHREWDNESS | 92 |
| X. | THE PRISONERS CAPTURE THE KING | 105 |
| XI. | THE COUNSEL OF THE WISE MEN | 116 |
| XII. | THE VILLAINY OF VILLAC UMU | 128 |
| XIII. | STANLEY’S PLAN | 140 |
| XIV. | SONCCO’S AID TO THE PLOTTERS | 151 |
| XV. | THE TERROR OF DARKNESS AT MIDDAY | 165 |
| XVI. | THE COMING OF THE TIGERS | 180 |
| XVII. | ANIMALS OF A BYGONE AGE | 193 |
| XVIII. | THE MAN IN THE CRATER | 205 |
| XIX. | THE BREACH IN THE MOUNTAIN IS CLOSED | 221 |
| XX. | THE KING IS CROWNED | 233 |