A body lay on the floor; the hands and arms were secured to the sides by straps; a tightly rolled pad of black cloth was fixed in the poor fellow's mouth. There was a ghastly wound on the side of his head from which the blood was still oozing; a great deal of it had congealed on his collar. A slight groan proved that the victim was still alive. "It's the hall porter," the manager cried. "It's poor Benwort. What a horrible thing!"

"Looks like concussion of the brain," Field said. "Thank goodness, here's Dr. Andrews. We will make a further search of these rooms, for it's pretty certain that the other fellow is here also. Ah, I felt very sure that we should find him."

A second man, also in the livery of the hotel, lay by a sofa. He seemed to have fared better, for there was no blood on his face, though a great swelling over his right ear testified to the fact that he had been severely handled. He was not insensible, but he hardly knew what he was talking about as he was placed on his feet.

"Tell us all about it," the inspector said encouragingly. "What really happened?"

"Don't ask me," Catton, the night watchman said, as he held his hands to his head. "My brain feels as if it had been squeezed dry. Somebody hit me on the head after a lady in grey came and fetched me. A little lady in grey, with a sad face and grey eyes."

Berrington started violently, and Mark looked up in surprise. The grey lady--Beatrice's Slave of Silence--seemed to run through this mystery like the thread of a story. It was an entirely interesting moment, but unhappily the night watchman could say no more.

"Don't worry me so," he whined. "Put some ice on my head and let me sleep. I dare say I shall be able to puzzle it out in time. Somebody carried something down the stairs; then the big door opened and the night porter whistled for a cab. That's all."

The speaker lurched forward and appeared to fall into a comatose state.

There was nothing for it but to put him to bed without delay. Field looked puzzled.

"I suppose that poor fellow was talking coherently in s.n.a.t.c.hes," he said. "No doubt just after he got that crack on the head he did see a bulky package taken downstairs. But then he says he heard the door open and a cab whistled for by the night porter. Now that's impossible, seeing that the night porter got his quietus also. Now who called up that cab? Evidently somebody did, and no doubt the cab came. Well, we shall find that cab. Saunders, go at once and see what you can do in the direction of finding that cab."

The mystery seemed to get deeper and deeper the more Field got on the track. He could quite understand how it was that both of these hotel servants had been put out of action, so to speak, but who was the grey lady who had given the note of warning, and why had those two men been placed in the suite of rooms belonging to the Rajah of Ahbad? The gagging and the hiding were all right, and that line of policy gave all the more time to the ruffians who had done this thing. Also it was possible on reflection to understand why the Rajah's room had been chosen, as no search, but for the b.l.o.o.d.y door handle, would have been made there. But where had those people procured those patent Brahma lock keys from?

The wild supposition that the Rajah himself was in the business was absurd. That idea might be dismissed on the spot. The more Field thought of it the more was he puzzled. He would take an early opportunity of seeing the Rajah.

"He's a quiet sort of man," the hotel manager explained. "I should fancy that he has an English mother, by the look of him. Anyway, he is English to all intents and purposes, having been educated at Eton and Oxford. He only took these rooms a few months ago; he was brought here after a bad illness, and when he went away he was carried to his carriage. But they say he's all right now. But, Mr. Inspector, you don't mean to say that you think that the Rajah----"

"Has any hand in this business? Of course I don't," Field said testily.

"I'm just a little put out this morning, so you must forgive my bad temper. The more one digs into the thing, the more black and misty it becomes. I think I'll go as far as the Yard and have a talk to one or two of our foreign men. Well, Saunders?"

"Well, I've done some good," Saunders said. "I have not found the cabman we want, but I've got on the track of another who can tell me something useful. He's a night man, and he is waiting down in the hall for you at this moment, sir."

"I think I'll go along, if you don't mind," Berrington suggested.

Field had no objection to make, and together the two descended to the hall. A little, apple-faced, shrivelled-looking man was waiting for them. There was no reason to ask his occupation--London cabman was written all over him in large letters.

"I can't tell you much, sir," he said. "It was just past two when I heard the whistle here. I was waiting with my cab at the corner of Shepherd Street. It's out of my line a bit, but I pulled up there in the hopes of getting a return fare. When I heard the whistle I came up with my cab, but I was just a shade too late. There was another cab before me, a black cab with a black horse, a rather swell affair. The driver was wearing a fur coat and a very shiny top hat. We had a few words, but the hotel porter told me to be off, and I went back to the stand where I stayed till just daylight. n.o.body else left the hotel in a cab."

"This is important," Field muttered. "By the way, would you recognize the hall porter again? You would! Then come this way and we will see if you can."

But the cabman was quite sure that the damaged man lying on the bed at the top of the hotel was not the same one who had ordered him away a few hours before. He was quite sure because the lights in the hotel portico were still full on, and he had seen the hall porter's face quite distinctly.

"A regular plant," Field exclaimed. "A clever thing indeed. Was the black cab empty when it came up, or was there anybody inside it?"

"Somebody was inside it," was the prompt reply. "A pale gentleman, very lame he was. He tried to get out of the cab but the driver pushed him back, and he and the hall porter hoisted the big trunk on top of the cab. And that's all, sir."

Berrington listened intently. He was struggling with some confused memory in which the grey lady and Stephen Richford were all mixed up together. Suddenly the flash of illumination came. He smote his hand on his knee.

"I've got it," he cried. "I've got it. The lame man of No. 100 Audley Place!"

CHAPTER XIII

Berrington's exclamation of surprise was not lost upon Inspector Field.

He stood obviously waiting for the gallant officer to say something. As there was a somewhat long pause, the inspector took up the parable for himself.

"In a great many cases that come under our hands, so many give us a chance," he said. "We allow something for luck. More than once in looking up one business I have come across a burning clue of another."

"What is the meaning of all this philosophy, Mr. Field?" Berrington asked.

"Well, I think it is pretty obvious, if you care to see it. We are engaged, just for the present, on looking for a private hansom, painted black, in which is seated a lame gentleman. The rest of our investigation does not matter just now, because we have beyond doubt actually traced the parties who conveyed the body of Sir Charles from the hotel. When the lame gentleman is spoken of you say something about No. 100, Audley Place. It is quite obvious that you know something of the man, or at any rate you think you do. May I point out that it is your duty to help us if you can."

Berrington looked uncomfortable. As a matter of fact he had made up his mind to say nothing as to Audley Place.

"There are several Audley Places in the Directory," Field went on. "I am sure you would not put us to the trouble of looking them all up, sir.

Tell me all you know. Anything that you may say will be treated as confidential."

"I quite see your reasoning," Berrington replied. "Let me tell you that I should have said nothing--for the present, at any rate--had I not betrayed myself. Look here, Field, I might just as well inform you that we are treading on very delicate ground here. As soon as I begin to speak, Sir Charles's daughter comes into the business."

"You mean Miss Darryll--Mrs. Richford, I should say. How, Colonel?"

"Because I am quite sure that she knows something of the matter. In the first place you must understand that the marriage was the reverse of a love match. Sir Charles's affairs were in anything but a prosperous condition at the time of his death."

"In fact he was on the point of being arrested in connection with a certain company," Field said coolly. "I got that information from the City Police. It was a mere piece of gossip, but I did not identify it as in any way connected with the subsequent tragedy."

"Well, I should not be surprised to hear that it had an important bearing on the mystery. As far as I could judge after the wedding there was a quarrel between Mr. and Mrs. Richford----"

"Ah!" Field exclaimed. His face was shrewd and eager. "Can you tell me what about?"

"Indeed, I cannot. I cannot even guess. But I can't see what that has to do with it."

"Can't you indeed, sir?" Field asked drily. "Mrs. Richford shall tell me herself, presently. But we are getting no nearer to the lame gentleman in Audley Place."

"Oh, yes we are. Let us admit that quarrel. I am certain of it because yesterday Mr. Richford had luncheon at the same table as myself. He ordered a steak and potatoes. When it came, he asked the waiter who had been putting salt on his plate. Sure enough there _was_ salt on the plate _and in the shape of a bullet_. Directly Richford saw that, his whole aspect changed. He was like one beside himself with terror. He did not know that I was watching him, he knew nothing beyond the horror of the moment."

"You mean that shaped salt had some hidden meaning, sir?" Field asked.

"I am certain of it. Now don't run your head up against the idea that you are on the track of some political society, or that Anarchism has anything to do with it. It so happens that I have seen that salt sign before in India under strange circ.u.mstances that we need not go into at the present moment. The man who pointed it out to me disappeared and was never heard of again. The sign was in his own plate at dinner. A little later I was enabled to get to the bottom of the whole thing; the story shall be told you in due course.

"Well, I wanted to see what Mr. Richford would do next. Was the sign an imperative one or not? Evidently it was, for he got up, finished his brandy, and left the table without having had a single mouthful of food.

Under ordinary conditions I should have taken no action, but you see Mrs. Richford is a great friend of mine, and I was anxious to see how far her husband was in with these people. To make a long story short, I followed Richford's cab and traced him to No. 100, Audley Place, which is somewhat at the back of Wandsworth Common. There I was so fortunate as to find a policeman who had been in my regiment, and he gave me all the information he could as to the inhabitants of the house. The gist of that information was that the owner of the house was a lame gentleman who sometimes went out in a bath chair. _Now_ you do see why I cried out when the cabman finished his story to-day?"

Field nodded thoughtfully. He saw perfectly well. For a little time he was silent, piecing the puzzle together. On the whole he was more than satisfied with the morning's work.

"I see," he said at length. "The lame gentleman, of course, sent the message to Mr. Richford. Within a few hours the body of Sir Charles disappears. Why, then, was this message sent? So that the lame man could get posted in all his facts with a view to stealing the body. In other words, Mrs. Richford's husband was a party to that daring crime. Why that body was fetched away we cannot inquire into, at present. What I want to know, and what I must know, is what Mrs. Richford and her husband quarrelled about."

Berrington winced. He had no pleasant vision of Beatrice being cross-examined by this sharp, shrewd policeman. And yet the thing was inevitable. Field's eyes asked a question.

"All right, Inspector," Berrington said, not without some irritation.