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PART I. CHAPTER I. MR. SHERLOCK HOLMES. CHAPTER II. THE SCIENCE OF DEDUCTION. CHAPTER III. THE LAURISTON GARDENS MYSTERY CHAPTER IV. WHAT JOHN RANCE HAD TO TELL. CHAPTER V. OUR ADVERTISEMENT BRINGS A VISITOR. CHAPTER VI. TOBIAS GREGSON SHOWS WHAT HE CAN DO. CHAPTER VII. LIGHT IN THE DARKNESS.