Chapter
I Vacation Plans
II Tragedy or Joke
III Talking it over
IV The Catwhisker
V A Baffling Situation
VI A Mystery and Cub's "Goat"
VII Returning Cub's "Goat"
VIII Mathematics or Geography?
IX The Radio Diagram
X The Island-Surrounded Island
XI The Deserted Camp
XII Hal's Discovery
XIII "Robinson Crusoe's" Diary
XIV More Light and More Mystery
XV The Hook-up on Shore
XVI Running down a Radio Fake
XVII Bud's Discovery
XVIII Unwelcome Visitors
XIX "S.O.S." from Friday Island
XX Four Prisoners
XXI The Hostage
XXII The "Crusoe Mystery" Deepens
XXIII "Sweating" the Prisoner
XXIV "Something Happens"
XXV Bud Shoots
XXVI The Slingshot Victim
XXVII Chased out
XXVIII A Radio Eavesdropper
XXIX The End of the "Mystery"
XXX The Result of a Radio Hazing