The following advertisement appeared in several of the London journals in the year 1832:—'If Owen Lloyd, a native of Wales, and who, it is believed, resided for many years in London as clerk in a large mercantile establishment, will forward his present address to X. Y. Z., Post-Office, St Martin's-le-Grand, to be left till called for, he will hear of something greatly to his advantage.'

My attention had been attracted to this notice by its very frequent appearance in the journal which I was chiefly in the habit of reading, and, from professional habits of thinking, I had set it down in my own mind as a trap for some offender against the principles of meum and tuum, whose presence in a criminal court was very earnestly desired. I was confirmed in this conjecture by observing that, in despair of Owen Lloyd's voluntary disclosure of his retreat, a reward of fifty guineas, payable by a respectable solicitor of Lothbury, was ultimately offered to any person who would furnish X. Y. Z. with the missing man's address. 'An old bird,' I mentally exclaimed on perusing this paragraph, 'and not to be caught with chaff; that is evident.' Still more to excite my curiosity, and at the same time bring the matter within the scope of my own particular functions, I found, on taking up the 'Police Gazette,' a reward of thirty guineas offered for the apprehension of Owen Lloyd, whose person and manners were minutely described. 'The pursuit grows hot,' thought I, throwing down the paper, and hastening to attend a summons just brought me from the superintendent; 'and if Owen Lloyd is still within the four seas, his chance of escape seems but a poor one.'

On waiting on the superintendent, I was directed to put myself in immediate personal communication with a Mr Smith, the head of an eminent wholesale house in the City.

'In the City!'

'Yes; but your business with Mr Smith is relative to the extensive robbery at his West-end residence a week or two ago. The necessary warrants for the apprehension of the suspected parties have been, I understand, obtained, and on your return will, together with some necessary memoranda, be placed in your hands.'

I at once proceeded to my destination, and on my arrival, was immediately ushered into a dingy backroom, where I was desired to wait till Mr Smith, who was just then busily engaged, could speak to me. Casting my eyes over a table, near which the clerk had placed me a chair, I perceived a newspaper and the 'Police Gazette,' in both of which the advertisements for the discovery of Owen Lloyd were strongly underlined. 'Oh, ho,' thought I; 'Mr Smith, then, is the X. Y. Z. who is so extremely anxious to renew his acquaintance with Mr Owen Lloyd; and I am the honoured individual selected to bring about the desired interview. Well, it is in my new vocation—one which can scarcely be dispensed with, it seems, in this busy, scheming life of ours.'

Mr Smith did not keep me waiting long. He seemed a hard, shrewd, business man, whose still wiry frame, brisk, active gait and manner, and clear, decisive eye, indicated—though the snows of more than sixty winters had passed over his head—a yet vigorous life, of which the morning and the noon had been spent in the successful pursuit of wealth and its accompaniment—social consideration and influence.

'You have, I suppose, read the advertisements marked on these papers?'

'I have, and of course conclude that you, sir, are X. Y. Z.'

'Of course conclusions,' rejoined Mr Smith with a quite perceptible sneer, 'are usually very silly ones: in this instance especially so. My name, you ought to be aware, is Smith: X. Y. Z., whoever he may be, I expect in a few minutes. In just seventeen minutes,' added the exact man of business; 'for I, by letter, appointed him to meet me here at one o'clock precisely. My motive in seeking an interview with him, it is proper I should tell you, is the probability that he, like myself, is a sufferer by Owen Lloyd, and may not therefore object to defray a fair share of the cost likely to be incurred in unkennelling the delinquent, and prosecuting him to conviction; or, which would be far better, he may be in possession of information that will enable us to obtain completely the clue I already almost grasp. But we must be cautious: X. Y. Z. may be a relative or friend of Lloyd's, and in that case, to possess him of our plans would answer no purpose but to afford him an opportunity of baffling them. Thus much premised, I had better at once proceed to read over to you a few particulars I have jotted down, which, you will perceive, throw light and colour over the suspicions I have been within these few days compelled to entertain. You are doubtless acquainted with the full particulars of the robbery at my residence, Brook Street, last Thursday fortnight?'