PRINTED IN THE UNITED STATES OF AMERICA

CONTENTS

CHAPTERPAGE
1[The Earthquake][1]
2[The Mysterious Hitchhiker][11]
3[Report from Interpol][18]
4[Another Tremor!][30]
5[Secret Cache][39]
6[Brungarian Coup][46]
7[Wall of Water!][55]
8[A Suspect Talks][65]
9[The Cave Monster][73]
10[Energy from Planet X][83]
11[An Electrical Christening][92]
12[Exman Takes Orders][99]
13[Disaster Strikes][106]
14[Air-borne Hijackers][115]
15[Kidnaped!][125]
16[A Unique Experiment][137]
17[An Urgent Warning][145]
18[Earthquake Island][155]
19[A Fiendish Machine][166]
20[The Robot Spy's Story][177]

The raiders transferred Exman to the enemy sub

[CHAPTER I]

THE EARTHQUAKE