Left thus alone in a strange house, Mr. Mitchel dropped into an easy chair and began to analyze the situation. He did not light the gas, as that would have betrayed his presence, but the glowing grate-fire shed light enough for him to see about him.
Mr. Eggleston had amassed a great collection of books, for the library was a long room occupying the whole of one side of the house, the parlors being on the opposite side of the hallway. Windows in front overlooked the street, and at the back opened upon a small yard. Just below these back windows extended a shed, the roof of an extension, which served as a laundry.
Mr. Mitchel went over in his mind the incidents which had been related to him, and two of his conclusions are worthy of note here:
"Barnes argues," thought he, "that Lumley may have taken the bank-note before he knew that it had been bequeathed to his sweetheart. But the same holds good with the girl herself, and might well explain her stealing what was really her own property. That is one point worth bearing in mind, but the best of all is my scheme for finding the note itself. Why should I trouble myself with a search which might occupy me all night, when by waiting I may see the thief take the note from its present hiding-place, always supposing that it is in this room? Decidedly, patience is a virtue in this instance, and I have only to wait."
A couple of hours later, Mr. Mitchel started up from a slight doze, and realized that he had been disturbed, though at first he could not tell by what.
Then he heard a sound which indicated that someone was fitting a key into the lock. Perhaps the thief was coming! This thought awakened him to his full faculties, and he quickly hid among the folds of some heavy draperies which served upon occasion to divide the room into two apartments. The door opened, and he heard the stealthy tread of soft footsteps, though at first the figure of the intruder was hidden from his view by the draperies which surrounded him. In a few moments his suspense was at an end. A young woman, of girlish figure, passed by him and went over to the fireplace. She was in a dainty night-robe, her long black hair hanging in rich profusion down her back. She leaned against the mantel, and gazed into the fire without moving, for some minutes, and then turning suddenly, crossed the room, going directly to one of the book-shelves. Here she paused, then took down several books which she placed upon a chair near by. Her back was towards Mr. Mitchel, but he could see her reach into the recess with her arm, which was bared by the act, the loose sleeve of her gown falling aside. Then there was a clicking sound just perceptible to the ear, and Mr. Mitchel muttered to himself:
"A secret closet, with a spring catch."
In another moment, the girl was replacing the books, and, this done, she hurried from the library, locking the door after her. Mr. Mitchel emerged from his hiding-place, and, going to the shelf where the girl had been, removed the books and searched for the spring which would unlock the secret compartment. It was not easily found, but Mr. Mitchel was a patient and persistent man, and after nearly an hour discovered the way of removing a sliding panel, and took an envelope from the recess behind. Carrying this to the fireplace, he dropped to his knees, and withdrawing its contents, held in his hand a Bank of England note for one thousand pounds. He looked at it, smiled, and said in a low tone:
"And Mr. Barnes was so certain that he would catch the thief!" Then he smiled again, replaced the books on the shelf, decided that the large sofa might serve as a comfortable bed, and so went to sleep.
He was awakened early, by a sense of cold. Starting up, for a moment dazed by his unfamiliar surroundings, he gazed first at the gray ashes of the dead fire in the grate, and then looked towards the windows thickly covered with frost, and shivered. Remembering where he was, he threw his arms about, and walked up and down the long room to start his blood moving, and induce a little warmth. Presently he went to the back windows and looked at the beautiful frosting, which resembled long fern leaves. Suddenly he seemed unusually interested, and especially attracted to one of the panes. He examined this closely, and taking a note-book from his pocket made a rapid sketch of the pattern on the glass. Then he raised the sash, looked out upon the shed, and emitted a low whistle. Next he stepped out through the window, went down on his hands and knees upon the tinned roof, and looked closely at something which he saw there. Returning to the room, one would have said that his next act was the most curious of all. He again opened the secret panel, and replaced the envelope containing the bank-note. Then he went to the table where Mr. Van Rawlston claimed that the note had vanished, and he sat in the chair where Mr. Van Rawlston had been when he read the will.