Published by

THE GOLDSMITH PUBLISHING CO.

CHICAGO

Copyright 1930

The Goldsmith Publishing Co.

Made in U. S. A.

CONTENTS

I[Waiting for Orders]
II[Perk Grows Suspicious]
III[The Hold-up]
IV[A Chance Clue]
V[When a Cog Slipped]
VI[Cyclone Proves Game]
VII[They Are Off]
VIII[Birds of a Feather]
IX[The Threatening Crash]
X[Flying Blind]
XI[An Unsolved Mystery]
XII[In the Colorado Canyon Country]
XIII[A Stranded Plane]
XIV[Jack Makes a Discovery]
XV[The Hand of Fate]
XVI[Suzanne Insists]
XVII[The Camp in the Canyon]
XVIII[The Vigilant Guard]
XIX[Over-Zealous Perk]
XX[An Unsubdued Spirit]
XXI[Combing the Mountain-Tops]
XXII[An Air-Mail Way Station]
XXIII[Perk Loses His Voice]
XXIV[One Chance in a Thousand]
XXV[The Never-Say-Die Spirit]
XXVI[Crater Lake]
XXVII[The End of the Trail]
XXVIII[Around the Campfire]
XXIX[No Prowlers Allowed]
XXX[Bringing In Their Man]