The hotel staff also recollected fairly distinctly that Miss Rosie Campbell was not in the steward’s room at suppertime that evening, but no one could remember definitely when she came in.

One of the chambermaids who occupied the bedroom adjoining hers, said that she heard her moving about soon after midnight; the hall porter declared that he saw her come in just before half-past twelve when he closed the doors for the night.

But one of the ground-floor valets said that, on the morning of the 4th, he saw Miss Marvell’s maid, in hat and coat, slip into the house and upstairs, very quickly and quietly, soon after the front doors were opened, namely, about 7:00 A.M.

Here of course, was a direct contradiction between the chambermaid and hall porter on the one side, and the valet on the other, whilst Miss Marvell said that Campbell came into her room and made her some tea long before seven o’clock every morning, including that of the 4th.

I assure you our fellows at the Yard were ready to tear their hair out by the roots, from sheer aggravation at this maze of contradictions which met them at every turn.

The whole thing seemed so simple. There was nothing “to it” as it were, and but very little real suggestion of foul play, and yet Mr. Leonard Marvell had disappeared, and no trace of him could be found.

Every one now talked freely of murder. London is a big town, and this would not have been the first instance of a stranger – for Mr. Leonard Marvell was practically a stranger in London – being enticed to a lonely part of the city on a foggy night, and there done away with and robbed, and the body hidden in an out-of-the-way cellar, where it might not be discovered for months to come.

But the newspaper-reading public is notably fickle, and Mr. Leonard Marvell was soon forgotten by every one save the chief and the batch of our fellows who had charge of the case.

Thus I heard through Danvers one day that Rosie Campbell had left Miss Marvell’s employ, and was living in rooms in Findlater Terrace, near Walham Green.

I was alone in our Maida Vale flat at the time, my dear lady having gone to spend the weekend with the Dowager Lady Loam, who was an old friend of hers; nor, when she returned, did she seem any more interested in Rosie Campbell’s movements than she had been hitherto.

Yet another month went by, and I for one had absolutely ceased to think of the man in the Inverness cape, who had so mysteriously and so completely vanished in the very midst of busy London, when, one morning early in January, Lady Molly made her appearance in my room, looking more like the landlady of a disreputable gambling house than anything else I could imagine.

“What in the world-” I began.

“Yes! I think I look the part,” she replied, surveying with obvious complacency the extraordinary figure which confronted her in the glass.

My dear lady had on a purple-cloth coat and skirt of a peculiarly vivid hue, and of a singular cut, which made her matchless figure look like a sack of potatoes. Her soft-brown hair was quite hidden beneath a “transformation,” of that yellow-reddish tint only to be met with in very cheap dyes.

As for her hat – I won’t attempt to describe it. It towered above and around her face, which was plentifully covered with brick-red and with that kind of powder which causes the cheeks to look a deep mauve.

My dear lady looked, indeed, a perfect picture of appalling vulgarity.

“Where are you going in this elegant attire?” I asked in amazement.

“I have taken rooms in Findlater Terrace,” she replied lightly. “I feel that the air of Walham Green will do us both good. Our amiable, if somewhat slatternly, landlady expects us in time for luncheon. You will have to keep rigidly in the background, Mary, all the while we are there. I said that I was bringing an invalid niece with me, and, as a preliminary, you may as well tie two or three thick veils over your face. I think I may safely promise that you won’t be dull.”

And we certainly were not dull during our brief stay at 34, Findlater Terrace, Walham Green. Fully equipped, and arrayed in our extraordinary garments, we duly arrived there, in a rickety four-wheeler, on the top of which were perched two seedy-looking boxes.

The landlady was a toothless old creature, who apparently thought washing a quite unnecessary proceeding. In this she was evidently at one with every one of her neighbours. Findlater Terrace looked unspeakably squalid; groups of dirty children congregated in the gutters and gave forth discordant shrieks as our cab drove up.

Through my thick veils I thought that, some distance down the road, I spied a horsy-looking man in ill-fitting riding-breeches and gaiters, who vaguely reminded me of Danvers.

Within half an hour of our installation, and whilst we were eating a tough steak over a doubtful table cloth, my dear lady told me that she had been waiting a full month, until rooms in this particular house happened to be vacant. Fortunately the population in Findlater Terrace is always a shifting one, and Lady Molly had kept a sharp eye on No. 34, where, on the floor above, lived Miss Rosie Campbell. Directly the last set of lodgers walked out of the ground-floor rooms, we were ready to walk in.

My dear lady’s manners and customs, whilst living at the above aristocratic address, were fully in keeping with her appearance. The shrill, rasping voice which she assumed echoed from attic to cellar.

One day I heard her giving vague hints to the landlady that her husband, Mr. Marcus Stone, had had a little trouble with the police about a small hotel which he had kept somewhere near Fitzroy Square, and where “young gentlemen used to come and play cards of a night.” The landlady was also made to understand that the wordily Mr. Stone was now living temporarily at His Majesty’s expense, whilst Mrs. Stone had to live a somewhat secluded life, away from her fashionable friends.

The misfortunes of the pseudo Mrs. Stone in no way marred the amiability of Mrs. Tredwen, our landlady. The inhabitants of Findlater Terrace care very little about the antecedents of their lodgers, so long as they pay their week’s rent in advance, and settle their “extras” without much murmur.

This Lady Molly did, with a generosity characteristic of an ex-lady of means. She never grumbled at the quantity of jam and marmalade which we were supposed to have consumed every week, and which anon reached titanic proportions. She tolerated Mrs. Tredwen’s cat, tipped Ermyntrude – the tousled lodging-house slavey – lavishly, and lent the upstairs lodger her spirit-lamp and curling-tongs when Miss Rosie Campbell’s got out of order.

A certain degree of intimacy followed the loan of those curling tongs. Miss Campbell, reserved and demure, greatly sympathized with the lady who was not on the best of terms with the police. I kept steadily in the background. The two ladies did not visit each other’s rooms, but they held long and confidential conversations on the landings, and I gathered, presently, that the pseudo Mrs. Stone had succeeded in persuading Rosie Campbell that, if the police were watching No. 34, Findlater Terrace, at all, it was undoubtedly on account of the unfortunate Mr. Stone’s faithful wife.

I found it a little difficult to fathom Lady Molly’s intentions. We had been in the house over three weeks, and nothing whatever had happened. Once I ventured on a discreet query as to whether we were to expect the sudden re-appearance of Mr. Leonard Marvell.

“For if that’s what it’s about,” I argued, “then surely the men from the Yard could have kept the house in view, without all this inconvenience and masquerading on our part.”

But to this tirade my dear lady vouchsafed no reply.

She and her newly acquired friend were, about this time, deeply interested in the case known as the “West End Shop Robberies,” which no doubt you recollect, since they occurred such a very little while ago. Ladies who were shopping in the large drapers’ emporiums during the crowded and busy sale time lost reticules, purses, and valuable parcels without any trace of the clever thief being found.