I Whistling Mystery 1

II Contact 10

III Friendly Enemies 20

IV A Glorious Fight 27

V A Good Show 34

VI Plane Wrecked 40

VII A Night’s Adventures 49

VIII A Look at a Mystery Plane 60

IX The Tagged Monkey 70

X “Hist There! You!” 78

XI Night Fighters 86

XII Up at Dawn 96

XIII The Jet Plane 105

XIV Ted’s Gony 115

XV The Secret Book 125

XVI Mostly Memories 134

XVII Voices in the Night 143

XVIII Luck, Pals and Providence 152

XIX Mysteries Deepen 158

XX A Ship from Some Other World 165

XXI Mary Brown from the U. S. A. 175

XXII Star of the Mist 183

XXIII Hot Cannibal Rivets 192

XXIV Twilight Battle 200

XXV Jack’s New Gunner 207

XXVI Jack’s Jet Plane Wins Its Way 217

XXVII Stratosphere Tactics 225

XXVIII The Jet Plane’s Last Battle 234

JET PLANE MYSTERY