"If ever an exclamation was eloquent that simple 'ah!' was. I could not see the speaker, but I knew she was leaning over the banisters from the landing above. I listened to hear her glide away. But she did not move. She was evidently collecting herself for the emergency of the moment. Presently she spoke again, and I was astonished at her tone: 'You have come from Police Headquarters,' was the remark with which she hailed me. "I lowered the parasol. I did not think it necessary to say yes. "'From a man there, called Gryce,' she went on, still in that strange tone I can hardly describe, sir. "'Since you ask me,' I now replied, 'I acknowledge that it is through his instructions I am here. He was anxious to restore to you your lost property. Is not this parasol yours? Shall I not leave it with this young girl?' "The answer was dry, almost rasping: 'Mr. Gryce has made a mistake. The parasol is not mine; yet he certainly deserves credit for the use he has made of it, in this search. I should like to tell him so. Is he at his office, and do you think I would be received?' "'He would be delighted,' I returned, not imagining she was in earnest. But she was, sir. In less time than you would believe, I perceived a very stately, almost severe, lady descend the stairs. She was dressed for the street, and spoke to me with quite an air of command. 'Have you a cab?' she asked. "'No,' said I. "'Then get one.' "Here was a dilemma. Should I leave her and thus give her an opportunity to escape, or should I trust to her integrity and the honesty of her look, which was no common one, sir, and obey her as every one about her was evidently accustomed to do? "I concluded to trust to her integrity, and went for the cab. But it was a risk, sir, which I promise not to repeat in the future. She was awaiting me on the stoop when I got back, and at once entered the hack with a command to drive immediately to Police Headquarters. I saw her as I came in just now sitting in the outer office, waiting for you. Are you ready to say I have done well?" Mr. Gryce, with an indescribable look of mingled envy and indulgence, pressed the hand held out to him, and passed out. His curiosity could be restrained no longer, and he went at once to where this mysterious woman was awaiting him. Did he think it odd that she knew him, that she sought him? If so, he did not betray this in his manner, which was one of great respect. But that manner suddenly changed as he came face to face with the lady in question. Not that it lost its respect, but that it betrayed an astonishment of a more pronounced character than was usually indulged in by this experienced detective. The lady before him was one well known to him; in fact, almost an associate of his in certain bygone matters; in other words, none other than that most reputable of ladies, Miss Amelia Butterworth of Gramercy Park. CHAPTER VI. SUGGESTIONS FROM AN OLD FRIEND.