"I recollect that there was a policeman on the opposite side of the road. Two youths in evening dress, both far from sober, pa.s.sed at the moment that we stopped. Stay, now I come to think of it, there was an old woman near us just before we said good-night to each other, and, if my memory serves me, she disappeared down the narrow pa.s.sage. It is strange that I should have forgotten the circ.u.mstance."

"An old woman? Can you give me a rather more detailed description of her? Of what cla.s.s was she?"

"Of the very poorest, I should say, and half witted. She was in rags, and was muttering some gibberish to herself. I am afraid I cannot tell you any more about her."

"That is rather a pity," said his companion. "I should like to have a little conversation with that good lady."

"You surely don't think she had anything to do with the Colonial Secretary's disappearance?" I replied with some surprise. "Why, she couldn't have had sufficient strength to harm a child, much less a strong, active man such as Mr Castellan was."

"Perhaps not, sir; it's just possible, however, that she may have had friends to do the work for her. I don't say, of course, that she _had_ anything to do with it, but it is our duty to look after every detail, and my experience has taught me that the most unexpected places often provide the most likely clues. Let us suppose, for instance, that she was only the decoy bird, and that the real perpetrators of the crime were concealed in the pa.s.sage. As soon as she had discovered Mr Castellan, she pa.s.sed into the lane and bade her confederates be on the alert; then, when he appeared, they would be ready to effect his capture. Doesn't that plot seem feasible enough, sir?"

"Very feasible," I felt compelled to admit; "but your case, like the proverbial figures, can be made to prove anything. However, if you think the old woman had anything to do with it, what action do you propose to take?"

"I shall try the street first, and endeavour to discover whether any one heard a scuffle or cries for help last night. Then it's possible the police on the beat may know something of the old woman, and be able to give us an insight into her character and ident.i.ty. In the meantime, if Mrs Castellan will permit it, I will interview the servants and endeavour to discover whether they noticed any suspicious characters loitering about near the house."

"I am sure Mrs Castellan will be only too pleased if you will do what you deem necessary," I replied.

The man thanked me, and the necessary orders were given for the servants to be ushered into the room. One by one they were subjected to a rigorous cross-examination at the hands of the two detectives. Neither the butler nor any of the men-servants had noticed anything suspicious in the front of the house, nor had they seen any old woman, answering to my description, hanging about the premises. The housekeeper and cook were equally positive in their a.s.sertions; indeed, the only person who had noticed anything peculiar was a young housemaid, who declared that she had seen two well-dressed men pa.s.s the house on three different occasions during the day. Each time they used the small pa.s.sage to which reference has been so often made. When pressed to describe them more accurately, she was unable to do so.

"They were just ordinary gentlemen," she said, "dressed in frock coats and silk hats, and they might have, or might not have, carried umbrellas in their hands." Further than this she declared she could not go, not if her life depended upon it.

"What makes you so sure that they pa.s.sed three times?" asked the smaller of the two detectives.

"Because I saw them first after breakfast, sir," the girl replied, "then in the middle of the morning, and the last time just before dinner."

This being all that could be extracted from her, the girl was dismissed from the room, and Mr Castellan's valet was recalled. From him an exact description of the clothes the missing man was wearing, and a record of the jewellery he had about his person, was obtained.

"This is no ordinary case of robbery," said the elder detective, "but it is always as well to know these things. One never knows how useful they may prove later on."

After asking a few more questions, they thanked me for the information I had given them and prepared to leave the house.

"You will be sure to acquaint Mrs Castellan with any discovery you may make?" I said. "I should like to be able to a.s.sure her of that?"

"You may, sir. She shall know directly we hear of anything."

Then they bowed themselves out, and I was at liberty to make my missing colleague's wife acquainted with the result of our interview. I found her still prostrated with grief and anxiety, a prey to the most agonising thoughts. I did what I could to comfort her, though I felt that my ministrations could do her no good. In my own heart I was quite certain that Castellan had been spirited away by the same mysterious agency that had deprived us of Woller. What that agency was, however, was more than I, or any one of us, could determine. When I left Carlton House Terrace I drove to the Foreign Office, where I had a consultation with the Prime Minister which lasted upwards of an hour, after which I returned to my residence.

I had intended going into the country that afternoon, but, in the light of this new calamity, I changed my mind and resolved to remain in Town.

Accordingly, after lunch I drove to my office, and remained there until towards evening. By three o'clock, as I have already said, the terrible intelligence was known all over the town. In all my experience I cannot remember a scene of greater excitement. Downing Street, in particular, was filled with an enormous crowd, eager to learn the latest news. In the public mind Castellan's disappearance figured as the work of an enemy, very probably by reason of the prominent part he had played in the history and development of the war. The wildest rumours were afloat concerning the affair, and every edition of the evening papers contained some new item connected with it. At four o'clock I bade my secretary telephone to Scotland Yard and enquire whether they had any information to impart. The reply was to the effect that their labours had so far been entirely fruitless. As in poor Woller's case, not a trace of the missing man could be discovered. Castellan could not have vanished more completely had he been caught up to the sky at the very moment that I had said "good-bye" to him.

"It is really most uncomfortable for every one concerned," my secretary remarked. "If this sort of thing is to continue, one does not know who the next victim may be."

He was quite right; one certainly _did not_ know. This much, however, was quite certain: whoever the persons might be who perpetrated the crime, they were past masters of their art. Their arrangements and the general conduct of the affair was perfection itself, and against such science it was almost impossible to guard. For my own part--and I don't think my worst enemies can accuse me of cowardice--I must confess to a distinct feeling of uneasiness when I reflected that this mysterious individual, or band, might possibly try his, or their, hand upon me. The suggestion emanating from Scotland Yard to the effect that we should avail ourselves of the offer of police protection, I politely, but firmly declined. The idea of being shadowed night and day by detectives was more than distasteful to me.

"Yet we do not desire to lose you, Sir George," said the Prime Minister later, and in saying it he was kind enough to pay me a compliment which my modesty will not permit me to repeat here. I owe him an apology in this matter, however, for I now see that he was right. If I should have to go through it all again, however, I feel that I should act as I did then.

At half-past four o'clock I left the office--by the back door this time, for I had no desire to be recognised by the crowd--and when I had crossed the Horse Guards Parade, set off in the direction of Marlborough House. As I walked along I thought of Castellan and of our meeting on the previous night. How little he had dreamt when he had carried on his airy badinage with Madame de Venetza that in less than three hours he would be gone from the sight of men! This naturally led me to think of the Countess. I recalled the expression upon her face, and the look in her eyes, when she had invited me to visit her again, and though, as I have said before, I do not in any way consider myself a lady's man, I am willing to confess that the recollection of her condescension gave me considerable satisfaction.

Not feeling in the humour for Piccadilly, and the raucous voices of the newsboys shouting--

"DISAPPEARANCE OF THE SECRETARY OF STATE FOR THE COLONIES: DISAPPEARANCE OF MR CASTELLAN!"

I continued my walk across the green Park in the direction of Hyde Park Corner. It was a beautiful evening, and in the twilight the Park presented as peaceful a scene as the soul of man could desire. Reaching the exit opposite Hamilton Place, I stood for a moment wondering whether I should cross into Hyde Park or stroll leisurely home. What it was I cannot say, but for some reason or another I had a strange desire for the companionship of my fellow men or women. It may have been that the sudden disappearance of Castellan had upset me more than I supposed. At any rate, I was far from being myself. As I stood there an idea struck me, and I wondered why it had not occurred to me before. What was there to prevent my visiting the Countess that evening? She had declared that she would be very glad to see me whenever I might call.

My mind was no sooner made up than I crossed the road and steered a course for Wiltshire House. On the way many friends would have stopped me had I permitted them to do so, but I strode resolutely along, paying no heed to them beyond returning their salutations. At last I reached the Countess's house and learnt that she was not only at home but would receive visitors. I found her in her boudoir seated before a bright fire, though the day had been comparatively warm.

"It is kind indeed of you to take pity upon my loneliness, Sir George,"

she said, as she rose to receive me. "No one could be more welcome. I have been feeling so very sad this afternoon, and now your society will cheer me up."

"You have heard of Mr Castellan's disappearance, I suppose?" I remarked, as I seated myself in the chair she indicated. "It has shocked you as it has done all of us!"

"Have you any way of accounting for it?" she asked.

"None whatever," I replied. "The whole affair is shrouded in mystery.

The police are unable to discover the faintest clue to work upon."

"It will have a very serious effect upon the country, will it not?" she enquired. "He has played such a conspicuous part in politics of late!"

"He will be missed, I fear," I answered, and stopped there, for I had no desire to discuss current politics just then.

Putting the topics of the day on one side, we at last came to the duration of her stay in London.

"I scarcely know how long we shall remain," she said. "I fancy my father is growing tired of London already. The war is perhaps accountable for it, but England is too sad just now. I do not like sad places. I prefer the sun, the warmth, the glitter, and to have smiling faces about me. I am afraid I must be peculiarly const.i.tuted, for the least thing is sufficient to raise or depress me." Then suddenly brightening up, she continued: "But there; what a foolish hostess I am to talk to you in this fashion. I shall frighten you away, and then you will not come and see me any more. I have no desire to lose so good a friend."

Man of the world though I was, the compliment tickled my vanity, and I hastened to reply in a suitable fashion. Then I congratulated her upon the success which had attended her "At Home" on the previous evening.

"In the matter of an 'At Home' it is not so very difficult to be successful," she replied. "One has only to give _carte blanche_ to one's cook and house-steward, dress oneself in one's best, and stand at the head of the stairs to receive one's guests with a conventional smile upon one's face. A dinner is a somewhat more difficult affair, and there, I think, without vanity, I may justly pride myself upon my ability. A cosy little dinner for, let us say, not more than eight people, each to be most carefully selected. Will you make one of them?"

"I shall be delighted," I replied. "But may it not be a compet.i.tion? My man has ambition. Why not let me try to equal your effort, even if I cannot excel it?"

"Try, by all means. And the prize?"

"The knowledge of success! What prize could be more worth winning?"

"It is settled then?" she returned. "We are each to give a dinner and to endeavour to outdo each other. I shall make my arrangements accordingly."

After that we drifted into a discussion upon books, pictures, and, by the natural transition of things, came at last to music. On this subject she was as well informed as upon every other.

"It is my pa.s.sion," she said in explanation. "My piano is the greatest treasure I possess. I could not live without it."

"I felt certain from the first that you were a musician," I replied. "I wonder if I could induce you to play to me?"

"I will do so with pleasure if you wish it?" she answered, and accordingly crossed the room to the corner where the piano stood.

Prepared as I was to find her a good _pianiste_, I did not dream for a moment that her talent was so great. As it was, she fascinated me from the moment that her fingers touched the keys. In explanation I might here remark that I am particularly susceptible to music, and now, under her influence, I sat spell-bound. The work was Saint Saen's "Danse Macabre," and in her hands the fierce madness of that remarkable composition was brought out with more than its usual _diablerie_.

In order to understand what is to follow, it must be remembered that I was seated near the fire-place, and that her piano was at the further end of the room, so that, placed as I was, I could not see my hostess.