I | The First Two Secrets | 1 | II | The Treasure of Venus | 9 | III | A Dangerous Target | 18 | IV | The Third Secret | 25 | V | A Mystery Indeed! | 34 | VI | Inside New Plymouth | 45 | VII | The Rhinosaur Stampede | 54 | VIII | One Secret is Revealed! | 66 | IX | The Price of a Brother | 71 | X | Alone in the Jungle | 81 | XI | The Friends are Separated | 97 | XII | The Price of a Boy | 107 | XIII | Outwitting the Outlaws | 116 | XIV | Captured! | 129 | XV | A City in the Trees | 140 | XVI | The Thunder of Rhinosaur Hooves | 155 | XVII | Teachers Can't Play Hookey | 172 | | Facts About Venus | 178 |
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