CONTENTS
CHAPTER PAGE [I “This is Our Secret”] 11 [II Spooky Waters] 22 [III A Bright Eyed Beach-Comber] 34 [IV Spies] 46 [V Whispering Depths] 54 [VI Real Progress!] 73 [VII Mystery Singers of the Night] 82 [VIII Monster of the Deep] 96 [IX Dave’s Electric Gun] 105 [X Little Big-Heads] 115 [XI Tigers of the Sea] 125 [XII Johnny’s Day Off] 136 [XIII The Green Arrow Trail] 150 [XIV An Important Discovery] 161 [XV Adrift in the Depths] 167 [XVI Voice of Drums] 174 [XVII Marching on the Castle] 183 [XVIII The Battle] 192 [XIX On the Bottom] 204