Such an experience could not fail to emphasize Mr. Gryce's interest in the case and heighten the determination he had formed to probe its secrets and explain all its extraordinary features. Arrived at Headquarters, where his presence was doubtless awaited with some anxiety by those who knew nothing of the cause of his long detention, his first act was to inquire if Bartow, the butler, had come to his senses during the night.

The answer was disappointing. Not only was there no change in his condition, but the expert in lunacy who had been called in to pass upon his case had expressed an opinion unfavorable to his immediate recovery.

Mr. Gryce looked sober, and, summoning the officer who had managed Bartow's arrest, he asked how the mute had acted when he found himself detained.

The answer was curt, but very much to the point.

"Surprised, sir. Shook his head and made some queer gestures, then went through his pantomime. It's quite a spectacle, sir. Poor fool, he keeps holding his hand back, so."

Mr. Gryce noted the gesture; it was the same which Bartow had made when he first realized that he had spectators. Its meaning was not wholly apparent. He had made it with his right hand (there was no evidence that the mute was left-handed), and he continued to make it as if with this movement he expected to call attention to some fact that would relieve him from custody.

"Does he mope? Is his expression one of fear or anger?"

"It varies, sir. One minute he looks like a man on the point of falling asleep; the next he starts up in fury, shaking his head and pounding the walls. It's not a comfortable sight, sir. He will have to be watched night and day."

"Let him be, and note every change in him. His testimony may not be valid, but there is suggestion in every movement he makes. To-morrow I will visit him myself."

The officer went out, and Mr. Gryce sat for a few moments communing with himself, during which he took out a little package from his pocket, and emptying out on his desk the five little spangles it contained, regarded them intently. He had always been fond of looking at some small and seemingly insignificant object while thinking. It served to concentrate his thoughts, no doubt. At all events, some such result appeared to follow the contemplation of these five sequins, for after shaking his head doubtfully over them for a time, he made a sudden move, and sweeping them into the envelope from which he had taken them, he gave a glance at his watch and passed quickly into the outer office, where he paused before a line of waiting men. Beckoning to one who had followed his movements with an interest which had not escaped the eye of this old reader of human nature, he led the way back to his own room.

"You want a hand in this matter?" he said interrogatively, as the door closed behind them and they found themselves alone.

"Oh, sir—" began the young man in a glow which made his more than plain features interesting to contemplate, "I do not presume——"

"Enough!" interposed the other. "You have been here now for six months, and have had no opportunity as yet for showing any special adaptability. Now I propose to test your powers with something really difficult. Are you up to it, Sweetwater? Do you know the city well enough to attempt to find a needle in this very big haystack?"

"I should at least like to try," was the eager response. "If I succeed it will be a bigger feather in my cap than if I had always lived in New York. I have been spoiling for some such opportunity. See if I don't make the effort judiciously, if only out of gratitude."

"Well, we shall see," remarked the old detective. "If it's difficulty you long to encounter, you will be likely to have all you want of it. Indeed, it is the impossible I ask. A woman is to be found of whom we know nothing save that she wore when last seen a dress heavily bespangled with black, and that she carried in her visit to Mr. Adams, at the time of or before the murder, a parasol, of which I can procure you a glimpse before you start out. She came from, I don't know where, and she went—but that is what you are to find out. You are not the only man who is to be put on the job, which, as you see, is next door to a hopeless one, unless the woman comes forward and proclaims herself. Indeed, I should despair utterly of your success if it were not for one small fact which I will now proceed to give you as my special and confidential agent in this matter. When this woman was about to disappear from the one eye that was watching her, she approached the curbstone in front of Hudson's fruit store on 14th Street and lifted up her right hand, so. It is not much of a clew, but it is all I have at my disposal, except these five spangles dropped from her dress, and my conviction that she is not to be found among the questionable women of the town, but among those who seldom or never come under the eye of the police. Yet don't let this conviction hamper you. Convictions as a rule are bad things, and act as a hindrance rather than an inspiration."

Sweetwater, to whom the song of the sirens would have sounded less sweet, listened with delight and responded with a frank smile and a gay:

"I'll do my best, sir, but don't show me the parasol, only describe it. I wouldn't like the fellows to chaff me if I fail; I'd rather go quietly to work and raise no foolish expectations."

"Well, then, it is one of those dainty, nonsensical things made of gray chiffon, with pearl handle and bows of pink ribbon. I don't believe it was ever used before, and from the value women usually place on such fol-de-rols, could only have been left behind under the stress of extraordinary emotion or fear. The name of the owner was not on it."

"Nor that of the maker?"

Mr. Gryce had expected this question, and was glad not to be disappointed.

"No, that would have helped us too much."

"And the hour at which this lady was seen on the curbstone at Hudson's?"

"Half-past four; the moment at which the telephone message arrived."

"Very good, sir. It is the hardest task I have ever undertaken, but that's not against it. When shall I see you again?"

"When you have something to impart. Ah, wait a minute. I have my suspicion that this woman's first name is Evelyn. But, mind, it is only a suspicion."

"All right, sir," and with an air of some confidence, the young man disappeared.

Mr. Gryce did not look as if he shared young Sweetwater's cheerfulness. The mist surrounding this affair was as yet impenetrable to him. But then he was not twenty-three, with only triumphant memories behind him.

His next hope lay in the information likely to accrue from the published accounts of this crime, now spread broadcast over the country. A man of Mr. Adams's wealth and culture must necessarily have possessed many acquaintances, whom the surprising news of his sudden death would naturally bring to light, especially as no secret was made of his means and many valuable effects. But as if this affair, destined to be one of the last to engage the powers of this sagacious old man, refused on this very account to yield any immediate results to his investigation, the whole day passed by without the appearance of any claimant for Mr. Adams's fortune or the arrival on the scene of any friend capable of lifting the veil which shrouded the life of this strange being. To be sure, his banker and his lawyer came forward during the day, but they had little to reveal beyond the fact that his pecuniary affairs were in good shape and that, so far as they knew, he was without family or kin.

Even his landlord could add little to the general knowledge. He had first heard of Mr. Adams through a Philadelphia lawyer, since dead, who had assured him of his client's respectability and undoubted ability to pay his rent. When they came together and Mr. Adams was introduced to him, he had been struck, first, by the ascetic appearance of his prospective tenant, and, secondly, by his reserved manners and quiet intelligence. But admirable as he had found him, he had never succeeded in making his acquaintance. The rent had been uniformly paid with great exactitude on the very day it was due, but his own visits had never been encouraged or his advances met by anything but the cold politeness of a polished and totally indifferent man. Indeed, he had always looked upon his tenant as a bookworm, absorbed in study and such scientific experiments as could be carried on with no other assistance than that of his deaf and dumb servant.

Asked if he knew anything about this servant, he answered that his acquaintance with him was limited to the two occasions on which he had been ushered by him into his master's presence; that he knew nothing of his character and general disposition, and could not say whether his attitude toward his master had been one of allegiance or antagonism.

And so the way was blocked in this direction.

Taken into the room where Mr. Adams had died, he surveyed in amazement the huge steel plate which still blocked the doorway, and the high windows through which only a few straggling sunbeams could find their way.

Pointing to the windows, he remarked:

"These were filled in at Mr. Adams's request. Originally they extended down to the wainscoting."

He was shown where lath and plaster had been introduced and also how the plate had been prepared and arranged as a barrier. But he could give no explanation of it or divine the purpose for which it had been placed there at so great an expense.

The lamp was another curiosity, and its varying lights the cause of increased astonishment. Indeed he had known nothing of these arrangements, having been received in the parlor when he visited the house, where there was nothing to attract his attention or emphasize the well-known oddities of his tenant.

He was not shown the starling. That loquacious bird had been removed to police headquarters for the special delectation of Mr. Gryce.

Other inquiries failed also. No clew to the owner of the insignia found on the wall could be gained at the pension office or at any of the G. A. R. posts inside the city. Nor was the name of the artist who had painted the portrait which adorned so large a portion of the wall a recognized one in New York City. Otherwise a clew might have been obtained through him to Mr. Adams's antecedents. All the drawers and receptacles in Mr. Adams's study had been searched, but no will had been found nor any business documents. It was as if this strange man had sought to suppress his identity, or, rather, as if he had outgrown all interest in his kind or in anything beyond the walls within which he had immured himself.

Late in the afternoon reports began to come in from the various tradesmen with whom Mr. Adams had done business. They all had something to say as to the peculiarity of his habits and the freaks of his mute servant. They were both described as hermits, differing from the rest of their kind only in that they denied themselves no reasonable luxury and seemed to have adopted a shut-in life from a pure love of seclusion. The master was never seen at the stores. It was the servant who made the purchases, and this by means of gestures which were often strangely significant. Indeed, he seemed to have great power of expressing himself by looks and actions, and rarely caused a mistake or made one. He would not endure cheating, and always bought the best.

Of his sanity up to the day of his master's death there was no question; but more than one man with whom he had had dealings was ready to testify that there had been a change in his manner for the past few weeks—a sort of subdued excitement, quite unlike his former methodical bearing. He had shown an inclination to testiness, and was less easily pleased than formerly. To one clerk he had shown a nasty spirit under very slight provocation, and was only endured in the store on account of his master, who was too good a customer for them to offend. Mr. Kelly, a grocer, went so far as to say he acted like a man with a grievance who burned to vent his spite on some one, but held himself in forcible restraint.

Perhaps if no tragedy had taken place in the house on —— Street these various persons would not have been so ready to interpret thus unfavorably a nervousness excusable enough in one so cut off from all communication with his kind. But with the violent end of his master in view, and his own unexplained connection with it, who could help recalling that his glance had frequently shown malevolence?

But this was not evidence of the decided character required by the law, and Mr. Gryce was about to regard the day as a lost one, when Sweetwater made his reappearance at Headquarters. The expression of his face put new life into Mr. Gryce.

"What!" he cried, "you have not found her?"

Sweetwater smiled. "Don't ask me, sir, not yet. I've come to see if there's any reason why I should not be given the loan of that parasol for about an hour. I'll bring it back. I only want to make a certain test with it."

"What test, my boy? May I ask, what test?"

"Please to excuse me, sir; I have only a short time in which to act before respectable business houses shut up for the night, and the test I speak of has to be made in a respectable house."

"Then you shall not be hindered. Wait here, and I will bring you the parasol. There! bring it back soon, my boy. I have not the patience I used to have."

"An hour, sir; give me an hour, and then——"

The shutting of the door behind his flying figure cut short his sentence.

That was a long hour to Mr. Gryce, or would have been if it had not mercifully been cut short by the return of Sweetwater in an even more excited state of mind than he had been before. He held the parasol in his hand.

"My test failed," said he, "but the parasol has brought me luck, notwithstanding. I have found the lady, sir, and——"

He had to draw a long breath before proceeding.

"And she is what I said," began the detective; "a respectable person in a respectable house."

"Yes, sir; very respectable, more respectable than I expected to see. Quite a lady, sir. Not young, but——"

"Her name, boy. Is it—Evelyn?"

Sweetwater shook his head with a look as naive in its way as the old detective's question.

"I cannot say, sir. Indeed, I had not the courage to ask. She is here——"

"Here!" Mr. Gryce took one hurried step toward the door, then came gravely back. "I can restrain myself," he said. "If she is here, she will not go till I have seen her. Are you sure you have made no mistake; that she is the woman we are after; the woman who was in Mr. Adams's house and sent us the warning?"

"Will you hear my story, sir? It will take only a moment. Then you can judge for yourself."

"Your story? It must be a pretty one. How came you to light on this woman so soon? By using the clew I gave you?"

Again Sweetwater's expression took on a touch of naÏvetÉ.

"I'm sorry, sir; but I was egotistical enough to follow my own idea. It would have taken too much time to hunt up all the drivers of hacks in the city, and I could not even be sure she had made use of a public conveyance. No, sir; I bethought me of another way by which I might reach this woman. You had shown me those spangles. They were portions of a very rich trimming; a trimming which has only lately come into vogue, and which is so expensive that it is worn chiefly by women of means, and sold only in shops where elaborate garnitures are to be found. I have seen and noticed dresses thus trimmed, in certain windows and on certain ladies; and before you showed me the spangles you picked up in Mr. Adams's study could have told you just how I had seen them arranged. They are sewed on black net, in figures, sir; in scrolls or wreaths or whatever you choose to call them; and so conspicuous are these wreaths or figures, owing to the brilliance of the spangles composing them, that any break in their continuity is plainly apparent, especially if the net be worn over a color, as is frequently the case. Remembering this, and recalling the fact that these spangles doubtless fell from one of the front breadths, where their loss would attract not only the attention of others, but that of the wearer, I said to myself, 'What will she be likely to do when she finds her dress thus disfigured?' And the answer at once came: 'If she is the lady Mr. Gryce considers her, she will seek to restore these missing spangles, especially if they were lost on a scene of crime. But where can she get them to sew on? From an extra piece of net of the same style. But she will not be apt to have an extra piece of net. She will, therefore, find herself obliged to buy it, and since only a few spangles are lacking, she will buy the veriest strip.' Here, then, was my clew, or at least my ground for action. Going the rounds of the few leading stores on Broadway, 23d Street, and Sixth Avenue, I succeeded in getting certain clerks interested in my efforts, so that I speedily became assured that if a lady came into these stores for a very small portion of this bespangled net, they would note her person and, if possible, procure some clew to her address. Then I took up my stand at Arnold's emporium. Why Arnold's? I do not know. Perhaps my good genius meant me to be successful in this quest; but whether through luck or what not, I was successful, for before the afternoon was half over, I encountered a meaning glance from one of the men behind the counter, and advancing toward him, saw him rolling a small package which he handed over to a very pretty and rosy young girl, who at once walked away with it. 'For one of our leading customers,' he whispered, as I drew nearer. 'I don't think she is the person you want.' But I would take no chances. I followed the young girl who had carried away the parcel, and by this means came to a fine brownstone front in one of our most retired and aristocratic quarters. When I had seen her go in at the basement door, I rang the bell above, and then—well, I just bit my lips to keep down my growing excitement. For such an effort as this might well end in disappointment, and I knew if I were disappointed now—But no such trial awaited me. The maid who came to the door proved to be the same merry-eyed lass I had seen leave the store. Indeed, she had the identical parcel in her hand which was the connecting link between the imposing house at whose door I stood and the strange murder in —— Street. But I did not allow my interest in this parcel to become apparent, and by the time I addressed her I had so mastered myself as to arouse no suspicion of the importance of my errand. You, of course, foresee the question I put to the young girl. 'Has your mistress lost a parasol? One has been found—' I did not finish the sentence, for I perceived by her look that her mistress had met with such a loss, and as this was all I wanted to know just then, I cried out, 'I will bring it. If it is hers, all right,' and bounded down the steps.

"My intention was to inform you of what I had done and ask your advice. But my egotism got the better of me. I felt that I ought to make sure that I was not the victim of a coincidence. Such a respectable house! Such a respectable maidservant! Should she recognize the parasol as belonging to her mistress, then, indeed, I might boast of my success. So praying you for a loan of this article, I went back and rang the bell again. The same girl came to the door. I think fortune favored me to-day. 'Here is the parasol,' said I, but before the words were out of my mouth I saw that the girl had taken the alarm or that some grievous mistake had been made. 'That is not the one my mistress lost,' said she. 'She never carries anything but black.' And the door was about to close between us when I heard a voice from within call out peremptorily: 'Let me see that parasol. Hold it up, young man. There! at the foot of the stairs. Ah!'

"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.