TOM SWIFT AND HIS FLYING LAB TOM SWIFT AND HIS JETMARINE TOM SWIFT AND HIS ROCKET SHIP TOM SWIFT AND HIS GIANT ROBOT TOM SWIFT AND HIS ATOMIC EARTH BLASTER TOM SWIFT AND HIS OUTPOST IN SPACE TOM SWIFT AND HIS DIVING SEACOPTER TOM SWIFT IN THE CAVES OF NUCLEAR FIRE TOM SWIFT ON THE PHANTOM SATELLITE TOM SWIFT AND HIS ULTRASONIC CYCLOPLANE TOM SWIFT AND HIS DEEP-SEA HYDRODOME TOM SWIFT IN THE RACE TO THE MOON TOM SWIFT AND HIS SPACE SOLARTRON TOM SWIFT AND HIS ELECTRONIC RETROSCOPE TOM SWIFT AND HIS SPECTROMARINE SELECTOR TOM SWIFT AND THE COSMIC ASTRONAUTS TOM SWIFT AND THE VISITOR FROM PLANET X * * * * * [Frontispiece: _The raiders transferred Exman to the enemy sub_] * * * * * The New Tom Swift Jr. Adventures TOM SWIFT AND THE VISITOR FROM PLANET X BY VICTOR APPLETON II ILLUSTRATED BY GRAHAM KAYE Grosset & Dunlap New York Publishers [c] by Grosset & Dunlap, Inc., 1961 All Rights Reserved Printed in the United States of America * * * * * 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 CHAPTER I THE EARTHQUAKE "Tom, we're having a problem with the gyro-stabilizer," said Mark Faber, gray-haired president of the Faber Electronics Company. "Hope you can find out what's wrong." The eighteen-year-old inventor accepted the challenge with a smile. "I'll be glad to try, sir," he replied. Bud Barclay, a dark-haired young flier and Tom Swift Jr.'s closest friend, chuckled. "If anyone can get the bugs out of your new invention, genius boy here will do it!" The two boys followed Mr. Faber and his engineers to a wooden building which was tightly guarded. Inside, a secret rocket-telemetering device was mounted on its test stand. "As you know, Tom," Mr. Faber began, "the usual conditions of rocket flight will be--"