"I have been foolish enough on occasions to leave it on the mantelshelf, but on those occasions I think I may say with certainty that the cupboard in which the box was placed was always locked. I was never without one key or the other. Say that once when this occurred, the thief, knowing that the box contained money, watched me out of the house. That then he entered the room, and, going to the cupboard, found it locked. That, being baffled by this circumstance, he saw upon the mantelshelf a key, which he guessed was the key of the iron box; that he took an impression of this key----" "In what?" interrupted Alfred, almost gaily. "In wax or putty? If he had either by him he must be a professional burglar. There are plenty of lodgers in the house, but I hardly suspected there was a person of that description here." "I don't think there is a person of that description in the house. Remember, Alfred, that what I am narrating is merely guess-work." "Capital guess-work, I should say, grandfather; you ought to have been a lawyer. But go on." "That he took an impression of this key," continued the old man, "in wax or putty, as you suggest. He may have come in prepared, or taking an impression in either may have been an afterthought. That from this impression he had a false key made. That on this night three weeks, when I had gone to the music-hall for Lily, the thief entered the room, found the cupboard open--it _was_ open, I remember--and completed the robbery." "A good case, grandfather, but quite circumstantial, you know." "Yes, I know, Alfred; quite circumstantial. In my thoughts I go farther even than this. I think that when the thief was opening the box, your mother may have been awake, or perhaps in that half-wakeful condition during which fancy and reality are so strangely commingled as not to be distinguishable one from the other. I think that, being in this condition, she saw the robbery committed, and that perhaps she knew the thief----" "Grandfather!" The exclamation was forced from Alfred's trembling lips; he could not have repressed it for his life. "What is the matter, Alfred?" "Nothing," stammered the young man; "it is late, and I was not well when I came home. Go on." "That knowing the thief, and not knowing whether what she saw was reality or a trick of the imagination, she dreaded, for a reason you shall presently be made acquainted with, to assure herself of the truth. I saw the dread in her watchful face and manner whenever I went to the cupboard; I saw the subject upon her lips and the fear to speak. I saw gratefulness struggling with doubt, as day after day went by and I did not refer to the loss. She yearned to know, and dreaded to ask. For had she asked and learned the truth, the bitterness of the past would have been sweet compared to the bitterness of the present! And so she passed away and was not sure."