1CHAPTER I “THIS IS OUR SECRET.”
11CHAPTER XI TIGERS OF THE SEA
2CHAPTER II SPOOKY WATERS
12CHAPTER XII JOHNNY’S DAY OFF
3CHAPTER III A BRIGHT EYED BEACH-COMBER
13CHAPTER XIII THE GREEN ARROW TRAIL
4CHAPTER IV SPIES
14CHAPTER XIV AN IMPORTANT DISCOVERY
5CHAPTER V WHISPERING DEPTHS
15CHAPTER XV ADRIFT IN THE DEPTHS
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6CHAPTER VI REAL PROGRESS!
16CHAPTER XVI VOICE OF DRUMS
7CHAPTER VII MYSTERY SINGERS OF THE NIGHT
17CHAPTER XVII MARCHING ON THE CASTLE
8CHAPTER VIII MONSTER OF THE DEEP
18CHAPTER XVIII THE BATTLE
9CHAPTER IX DAVE’S ELECTRIC GUN
19CHAPTER XIX ON THE BOTTOM
10CHAPTER X LITTLE BIG-HEADS
