The Apartment Next Door by William Johnston AUTHOR OF THE HOUSE OF WHISPERS, LIMPY, ETC. ILUSTRATIONS BY ARTHUR WILLIAM BROWN 1919 TO THAT MARVELLOUS SCHEHERAZADE CAROLYN WELLS HOUGHTON THE AUTHOR, IN ENVIOUS ADMIRATION, DEDICATES THIS VOLUME CONTENTS CHAPTER I. THE FACE OF HATE CHAPTER II. THE ADDRESS ON THE CARD CHAPTER III. “MR. FLECK” CHAPTER IV. THE CLUE IN THE BOOK CHAPTER V. ON THE TRAIL CHAPTER VI. THE MISSING MESSAGE CHAPTER VII. THE WOMAN ON THE ROOF CHAPTER VIII. THE LISTENING EAR CHAPTER IX. THE PURSUIT CHAPTER X. CARTER’S DISCOVERY CHAPTER XI. JANE’S ADVENTURE CHAPTER XII. PUZZLES AND PLANS CHAPTER XIII. THE SEALED PACKET CHAPTER XIV. THE MOUNTAIN’S SECRET CHAPTER XV. THE HOUSE IN THE WOODS CHAPTER XVI. THE ATTACK ON THE HOUSE CHAPTER XVII. SOMETHING UNEXPECTED CHAPTER XVIII. WHAT THE PACKET CONTAINED LIST OF ILLUSTRATIONS She could not bring herself to tell him, the man she loved, the thing she knew he was. More than likely, she alone in all the world—knew who the murderer was. Had he been standing there listening? How much had he heard? “Thank God,” he cried. “Jane, dear, tell me you are not hurt!” THE APARTMENT NEXT DOOR CHAPTER I THE FACE OF HATE It was three o’clock in the morning. Along a deserted pavement of Riverside Drive strode briskly a young man whose square-set shoulders and erect poise suggested a military training. His coat, thrown carelessly open to the cold night wind, displayed an expanse of white indicative of evening dress. As he walked his heels clicked sharply on the concrete with the forceful firm tread of the type which does things quickly and decisively. The intense stillness of the early morning hours carried the sound in little staccato beats that could be heard blocks away. A few yards behind him, moving furtively and noiselessly, almost as if he had been shod with rubber, crept another figure, that of a stocky, broad-shouldered man, who despite his bulk and weight moved silently and swiftly through the night, a soft brown hat drawn low over his eyes as if he desired to avoid recognition. All at once the man ahead paused suddenly and stood looking out over the river. Between the Drive and the distance-dimmed lights of the Jersey shore there rose like great silhouettes the grim figures of several huge steel-clad battleships, their fighting-tops lost in the shadows of the opposite hills. Beside them, obscure, with no lights visible, lay the great transports that in a few hours, or in a few days—who knew—they would be convoying with their precious cargo of fighting men across the war-perilled Atlantic. It was on the forward deck of one of these great battleships that the eyes of the man ahead were riveted. His shadower, evidently much concerned in his actions, crept slowly and stealthily forward, approaching nearer and still nearer without being observed.