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Index
CHAPTER I
A PACKAGE VANISHES
CHAPTER II
DIFFICULTIES AND DANGERS
CHAPTER III
THE MAN WITH THE SCAR
CHAPTER IV
THE LENA KNOBLOCH
CHAPTER V
TWO MYSTERIOUS CHANGES
CHAPTER VI
A DIFFICULT DEPARTURE
CHAPTER VII
A WARNING FROM THE SEA
CHAPTER VIII
MORE ABOUT THE “U-13”
CHAPTER IX
A STRANGE VISIT
CHAPTER X
SHIPWRECK AND RESCUE
CHAPTER XI
A FLEET OF SUBMARINES
CHAPTER XII
A NEW “U-13” APPEARS
CHAPTER XIII
A THREATENING SITUATION
CHAPTER XIV
HELPED BY AN ENEMY
CHAPTER XV
MISTAKEN IDENTITY
CHAPTER XVI
A STRANGE DISCOVERY
CHAPTER XVII
ALONE AND HELPLESS
CHAPTER XVIII
HELP FROM A STRANGER
CHAPTER XIX
MACKINDER AGAIN
CHAPTER XX
A MYSTERIOUS CRAFT
CHAPTER XXI
A MYSTERY EXPLAINED
CHAPTER XXII
MORE MYSTERY
CHAPTER XXIII
THE MYSTERY OF THE “U-13”
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