Contents [CHAPTER I. THE MASTER OF HARKINGS] [CHAPTER II. AT TWILIGHT] [CHAPTER III. A DISCOVERY] [CHAPTER IV. BETWEEN THE DESK AND THE WINDOW] [CHAPTER V. IN WHICH BUDE LOOKS AT ROBIN GREVE] [CHAPTER VI. THE LETTER] [CHAPTER VII. VOICES IN THE LIBRARY] [CHAPTER VIII. ROBIN GOES TO MARY] [CHAPTER IX. MR. MANDERTON] [CHAPTER X. A SMOKING CHIMNEY] [CHAPTER XI. “... SPEED THE PARTING GUEST!”] [CHAPTER XII. MR. MANDERTON IS NONPLUSSED] [CHAPTER XIII. JEEKES] [CHAPTER XIV. A SHEET OF BLUE PAPER] [CHAPTER XV. SHADOWS] [CHAPTER XVI. THE INTRUDER] [CHAPTER XVII. A FRESH CLUE] [CHAPTER XVIII. THE SILENT SHOT] [CHAPTER XIX. MR. MANDERTON LAYS HIS CARDS ON THE TABLE] [CHAPTER XX. THE CODE KING] [CHAPTER XXI. A WORD WITH MR. JEEKES] [CHAPTER XXII. THE MAN WITH THE YELLOW FACE] [CHAPTER XXIII. TWO’S COMPANY ...] [CHAPTER XXIV. THE METAMORPHOSIS OF MR. SCHULZ] [CHAPTER XXV. THE READING OF THE RIDDLE] [CHAPTER XXVI. THE FIGURE IN THE DOORWAY] [CHAPTER XXVII. AN INTERRUPTION FROM BEYOND] [CHAPTER XXVIII. THE DEATH OF HARTLEY PARRISH]