"It was this: if on the following night Sir Marcus should present himself she was to tell him that Miss Merlin would take supper in his company after the performance, but that he was to observe every possible precaution. Marie, according to her account, at first declined to entertain the proposal, but being informed that it was merely intended to play a practical joke upon the baronet, she ultimately consented. I may add that the promise of a ten-pound note undoubtedly hastened her decision and it was on her receipt of the amount by post on the following morning that she determined to carry out her part of the bargain.

"Her instructions had been explicit. She was to tell Sir Marcus that Miss Merlin would see him after the performance, then when he presented himself, to inform him that her mistress had decided it would be more prudent for him to proceed to the rendezvous alone, where she would join him in a quarter of an hour. She was to give him the door key (which had arrived with the money) and to direct him to enter and wait in the room on the right of the hall. A cabman who knew the address would be waiting at the stage door."

Gatton paused, puffing slowly at his pipe, then: "Unknown to Miss Merlin," he continued, "this scheme was carried out. Sir Marcus presented himself at ten o'clock and received Marie's message; he returned about eleven and she told him, as she had been instructed, that her mistress would join him in a quarter of an hour. Curiosity respecting the joke which she believed was being played upon the baronet prompted her to go outside the stage-door to see if there was actually a cab waiting. There was, and she heard Sir Marcus ask the man if he knew the address to which he was to drive.

"The cabman replied that he did, and Marie claims to know no more about the matter, except that Sir Marcus drove off in the cab, and that her mistress returned to her flat alone about a quarter of an hour later. Next point. Inquiries for the cabman have been made at all the ranks since early this morning, and he turned up at the Yard about a couple of hours ago. His story is simple enough; some one called up the rank where he chanced to be standing that evening, instructing him to call for Sir Marcus at the stage-door of the New Avenue Theater and to drive him to--"

He paused:

"Yes?"

"To the Red House!"

"At last we have it!" I cried excitedly.

"There is no doubt of it," answered Gatton; "the cabman drove him there, and it was certainly at the Red House that he met his death.

Indeed the cabby appears to be the last witness who spoke to the murdered man. He inquired his way to the Red House from a chance pedestrian, a tramp, whom he met at the corner of College Road. He has even described this person to us, but I don't think his evidence of sufficient importance to justify our searching for him. On reaching the Red House the cabman and his fare found it to be vacant. Sir Marcus, however, who had a very brusk manner with his inferiors, having paid the cabman, curtly dismissed him, and the man, who admits having bargained for a double fare for the journey, because it was such an out-of-the-way spot, drove away vaguely curious, but not so curious as another might have been, since London cabmen are used to strange jobs."

"We are getting near the heart of the mystery."

"H'm," said Gatton, "I'm not so sure. The deeper we go the darker it gets. A man has been scouring the neighborhood all day in quest of the carter who delivered the crate to the docks, but so far without results. I consider it a very important point that we should learn not only how and when the crate was collected, but when and by whom it was delivered at the garage."

"Another question," I said: "although I believe I know the answer. Was it a man or a woman who ordered the cab?"

"Both in the case of Marie and in the case of the cab-rank," replied Gatton, "it was a woman's voice that spoke."

"Thank G.o.d, one doubt is resolved!" I said. "It cannot possibly have been Isobel in either of these cases!"

"Right!" agreed Gatton, promptly. "I am as glad as you are. There is clearly a second woman in the case; yet I can't bring myself to believe that this elaborate scheme was the work of a woman."

"Not of a _jealous_ woman?" I suggested.

"Not of any woman," he replied. "Besides--who put the body into the crate? What kind of a woman would it be who could do a deed like that?"

"In other words," said I, "you are still without a ghost of a clew to the ident.i.ty of the person who committed the murder, and to the means employed?"

Resting his pipe upon an ash-tray, the Inspector took up from my writing-table the little image of Bast and held it up between finger and thumb.

"We always come back to the green cat," he said slowly. "I will trouble you now, Mr. Addison, for the history of such a little image as this."

"Yes," I replied abstractedly. "But there is a matter about which I have not spoken to you hitherto because quite frankly I had doubted if it had any existence outside my imagination; but every new development of the case is so utterly fantastic that I no longer regard my experience as being in the least degree outside the province of possibility. Before we go further, therefore, into the purely archaeological side of the inquiry (and I have still serious doubt respecting the usefulness of such a quest) let me relate a peculiar experience which I had last night after I had left Bolton."

Gatton listened in silence whilst I gave him an account of that evasive shadow which I had perceived behind me, and then of the great cat's eyes which had looked in through the window.

His expression of nave wonderment was almost funny; and when I had concluded:

"Well, Mr. Addison," said he, "if you had told me this story before I had taken up 'the _Oritoga_ mystery,' for so I observe--" drawing an evening paper from his pocket--"the press has agreed to ent.i.tle the case, I should have suggested that your peculiar studies had begun to tell upon your nerves; but this voice on the 'phone and this empty house in which only one room was furnished, finally the green cat painted on the packing-case and the green cat which stands there upon the table have prepared me for even stranger things than your adventure of last night."

"Yet," I urged, "there is no visible connection between the episodes of the case and this strange apparition which I saw in the garden last night."

"There was no visible connection between Sir Marcus's body in a packing-case in the hold of the _Oritoga_ and the garage of the house in College Road until we found one," retorted Gatton. "Anyway I am glad you mentioned the matter to me; I will take a note of it, for it may prove to provide a link in the chain. And now"--taking out a note-book and pencil--"for the history of these cat things."

I sighed rather wearily as I crossed the room to my bookcase and took down the volume of Gaston Maspero, the same which I had been reading but had returned to its shelf as Gatton had been admitted.

"We have it here in a nutsh.e.l.l," I said.

Gatton methodically noted the pa.s.sages which I read to him. The task concluded:

"H'm," he muttered, scanning his notes, "very strange, very strange indeed. 'She had also her hours of treacherous perversity, during which she played with her victim as with a mouse, before finishing him off with a blow of her claws.'"

He raised his eyes and stared at me strangely.

"She played with her victim as with a mouse," he murmured, "before finishing him off with a blow--"

CHAPTER VIII

MY VISITOR

For long enough after Gatton's departure I sat thinking over our conversation. Despite the lateness of the hour at which he had departed, he had had no thought of rest and was setting out in quest of further evidence to point to the author of Sir Marcus's death. The room was laden with tobacco smoke, for our conference had lasted more than two hours, but dusk was very fully established and when presently as I sat there in the dark contemplating the horrible labyrinth into which my steps had drifted, Coates entered.

"Ah, Coates," I said, "light up."

He switched on the electric light and I saw layers of smoke--clouds drifting from the open window towards the newly opened door.

"Shall you be going out again to-night, sir?" asked Coates, standing rigidly to attention as was his custom when addressing me.

"I think not, Coates," I replied. "I have done enough for one day, but I should be glad if you would ring up the New Avenue Theater and inquire if Miss Merlin will speak to me. It will be about time now for the performance to have finished."

"Very good, sir," said Coates, and proceeded to make the call, whilst I sat listlessly smoking and listening to his voice. Presently:

"Miss Merlin did not appear to-night, sir," he announced: "she is indisposed."

"I thought as much," I muttered. "I could hardly have expected after such a day of horror and excitement that she would have been capable of appearing to-night. Ring up her flat, Coates," I added. "I should like to speak to her, for I know she is in great trouble."

"Indeed, sir," Coates permitted himself to remark. "Is it something to do with the discovery at the docks this morning, sir?"

"It is, Coates," I replied. "It is an utterly d.a.m.nable business."

"Indeed, sir," said Coates again, and went to the telephone.

Three minutes later I was talking to Isobel.

"I find it utterly impossible to tell you what has happened," she declared, "since I saw you last. I feel incapable of thinking, and of course it was quite out of the question for me to go to the theater to-night. But it is not so bad as it might have been." She hesitated, then: "I was only able to give them very short notice unfortunately, but from a selfish point of view, as you know--I was leaving the stage--very shortly--"