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1. CHAPTER I. A PACKAGE VANISHES2. CHAPTER II. DIFFICULTIES AND DANGERS3. CHAPTER III. THE MAN WITH THE SCAR4. CHAPTER IV. THE LENA KNOBLOCH5. CHAPTER V. TWO MYSTERIOUS CHANGES6. CHAPTER VI. A DIFFICULT DEPARTURE7. CHAPTER VII. A WARNING FROM THE SEA8. CHAPTER VIII. MORE ABOUT THE "U-13"9. CHAPTER IX. A STRANGE VISIT10. CHAPTER X. SHIPWRECK AND RESCUE11. CHAPTER XI. A FLEET OF SUBMARINES12. CHAPTER XII. A NEW "U-13" APPEARS13. CHAPTER XIII. A THREATENING SITUATION14. CHAPTER XIV. HELPED BY AN ENEMY15. CHAPTER XV. MISTAKEN IDENTITY16. CHAPTER XVI. A STRANGE DISCOVERY17. CHAPTER XVII. ALONE AND HELPLESS18. CHAPTER XVIII. HELP FROM A STRANGER19. CHAPTER XIX. MACKINDER AGAIN20. CHAPTER XX. A MYSTERIOUS CRAFT21. CHAPTER XXI. A MYSTERY EXPLAINED22. CHAPTER XXII. MORE MYSTERY23. CHAPTER XXIII. THE MYSTERY OF THE "U-13"