CHAPTER I TRYING OUT THE NEW BIPLANE

CHAPTER XVII GALLANT ANDY

CHAPTER V FIGURING IT ALL OUT

CHAPTER VII SEEN FROM THE EAGLES' EYRIE

CHAPTER XIV SOMETHING DOING

CHAPTER III THE MEN IN THE TOURING CAR

CHAPTER II A RESCUER FROM THE SKIES

CHAPTER XV THE AWAKENING

CHAPTER XI A NEW ALARM

CHAPTER VI AN UNKNOWN ENEMY

CHAPTER XIII THE CHALLENGE

CHAPTER XII SANDY DROPS SOMETHING

CHAPTER X IN PARTNERSHIP WITH THE CHIEF

CHAPTER IX STARTLING NEWS OVER THE WIRE

CHAPTER XVI THE CHIEF MEETS AN OLD FRIEND

CHAPTER VIII MYSTERIOUS MR. MARSH AT IT AGAIN

CHAPTER IV SUSPICION

CHAPTER XIX THE MYSTERY STILL UNSOLVED

CHAPTER XXI THE RACE WITH THE STORM

CHAPTER XXII A TERRIBLE MOMENT ON OLD THUNDER TOP