| Chapter | Page | | I. | The Man in Section Thirteen | 7 | | II. | The Missing Passenger | 19 | | III. | A Dizzy Round of Pleasure | 32 | | IV. | Battle of the Bulls and Bears | 45 | | V. | An Embarrassing Moment | 56 | | VI. | The Wreck of Mr. A. Bubble | 68 | | VII. | The Mystery of the Iron Gates | 75 | | VIII. | Exploring the Secret Passage | 84 | | IX. | In an Indian Graveyard | 96 | | X. | Meeting a Treasure Hunter | 106 | | XI. | Giving an Attic Party | 116 | | XII. | A Curious Old Journal | 127 | | XIII. | The Mystery of the Attic | 136 | | XIV. | Tommy Takes a Wild Ride | 143 | | XV. | An Amazing Occurrence | 154 | | XVI. | Bob Solves Another Mystery | 164 | | XVII. | A Long-Remembered Christmas | 178 | | XVIII. | Bab's Exciting Discovery | 187 | | XIX. | A Bitter Disappointment | 195 | | XX. | Conclusion | 204 |
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