CONTENTS


Chapter Page

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