Produced by Annie McGuire [Illustration: Both girls gasped and stared incredulously] THE BOARDED-UP HOUSE BY AUGUSTA HUIELL SEAMAN Author of "Jacqueline of The Carrier Pigeons," etc. WITH ILLUSTRATIONS BY C. CLYDE SQUIRES NEW YORK THE CENTURY CO. Copyright, 1915, by THE CENTURY CO. CONTENTS CHAPTER PAGE I GOLIATH LEADS THE WAY 3 II IN SEARCH OF ADVENTURE 22 III AMATEUR DETECTIVES 33 IV THE ROOM OF MYSTERY 46 V JOYCE MAKES A NEW DISCOVERY. SO DOES GOLIATH 56 VI JOYCE'S THEORY 68 VII GOLIATH MAKES ANOTHER DISCOVERY 79 VIII CYNTHIA HAS AN IDEA 90 IX THE MEMORIES OF GREAT-AUNT LUCIA 107 X AN EXCITING DISCOVERY 122 XI THE ROOM THAT WAS LOCKED 135 XII A SLIGHT DISAGREEMENT 145 XIII THE GREAT ILLUMINATION 154 XIV THE MEDDLING OF CYNTHIA 166 XV THE STRANGER AT THE DOOR 173 XVI JOYCE EXPLAINS 184 XVII IN WHICH ALL MYSTERIES ARE SOLVED 192 LIST OF ILLUSTRATIONS Both girls gasped and stared incredulously _Frontispiece_ A flight of stairs could be dimly discerned 19 They stared with the fascination of horror 43 "Well, what do you suppose that can be?" queried Cynthia 61 "Do you know any real elderly people, father?" 99 "Oh, I wish I were Sherlock Holmes!" 125 There was nothing to do but sit and enjoy the spectacle 161 Then, with one accord they began to steer their way around the furniture 213 CHAPTER I GOLIATH LEADS THE WAY