He called out "Entrez!" The police entered the room. Charles explained as well as he could in most doubtful Parisian what they were next to do. The Colonel drew himself up in an indignant attitude. He turned and addressed them in excellent French.

"I am an officer in the service of her Britannic Majesty," he said. "On what ground do you venture to interfere with me, messieurs?"

The chief policeman explained. The Colonel turned to Charles. "Your name, sir?" he inquired.

"You know it very well," Charles answered. "I am Sir Charles Vandrift; and, in spite of your clever disguise, I can instantly recognise you. I know your eyes and ears. I can see the same man who cheated me at Nice, and who insulted me on the island."

"You Sir Charles Vandrift!" the rogue cried. "No, no, sir, you are a madman!" He looked round at the police. "Take care what you do!" he cried. "This is a raving maniac. I had business just now with Sir Charles Vandrift, who quitted the room as these gentlemen entered. This person is mad, and you, monsieur, I doubt not," bowing to me, "you are, of course, his keeper."

"Do not let him deceive you," I cried to the police, beginning to fear that with his usual incredible cleverness the fellow would even now manage to slip through our fingers. "Arrest him, as you are told. We will take the responsibility." Though I trembled when I thought of that cheque he held of mine.

The chief of our three policemen came forward and laid his hand on the culprit's shoulder. "I advise you, M. le Colonel," he said, in an official voice, "to come with us quietly for the present. Before the juge d'instruction we can enter at length into all these questions."

The Colonel, very indignant still—and acting the part marvellously—yielded and went along with them.

"Where's Medhurst?" Charles inquired, glancing round as we reached the door. "I wish he had stopped with us."

"You are looking for monsieur your friend?" the landlord inquired, with a side bow to the Colonel. "He has gone away in a fiacre. He asked me to give this note to you."

He handed us a twisted note. Charles opened and read it. "Invaluable man!" he cried. "Just hear what he says, Sey: 'Having secured Colonel Clay, I am off now again on the track of Mme. Picardet. She was lodging in the same house. She has just driven away; I know to what place; and I am after her to arrest her. In blind haste, MEDHURST.' That's smartness, IF you like. Though, poor little woman, I think he might have left her."

"Does a Mme. Picardet stop here?" I inquired of the landlord, thinking it possible she might have assumed again the same old alias.

He nodded assent. "Oui, oui, oui," he answered. "She has just driven off, and monsieur your friend has gone posting after her."

"Splendid man!" Charles cried. "Marvillier was quite right. He is the prince of detectives!"

We hailed a couple of fiacres, and drove off, in two detachments, to the juge d'instruction. There Colonel Clay continued to brazen it out, and asserted that he was an officer in the Indian Army, home on six months' leave, and spending some weeks in Paris. He even declared he was known at the Embassy, where he had a cousin an attaché; and he asked that this gentleman should be sent for at once from our Ambassador's to identify him. The juge d'instruction insisted that this must be done; and Charles waited in very bad humour for the foolish formality. It really seemed as if, after all, when we had actually caught and arrested our man, he was going by some cunning device to escape us.

After a delay of more than an hour, during which Colonel Clay fretted and fumed quite as much as we did, the attaché arrived. To our horror and astonishment, he proceeded to salute the prisoner most affectionately.

"Halloa, Algy!" he cried, grasping his hand; "what's up? What do these ruffians want with you?"

It began to dawn upon us, then, what Medhurst had meant by "suspecting everybody": the real Colonel Clay was no common adventurer, but a gentleman of birth and high connections!

The Colonel glared at us. "This fellow declares he's Sir Charles Vandrift," he said sulkily. "Though, in fact, there are two of them. And he accuses me of forgery, fraud, and theft, Bertie."

The attaché stared hard at us. "This is Sir Charles Vandrift," he replied, after a moment. "I remember hearing him make a speech once at a City dinner. And what charge have you to prefer, Sir Charles, against my cousin?"

"Your cousin?" Charles cried. "This is Colonel Clay, the notorious sharper!"

The attaché smiled a gentlemanly and superior smile. "This is Colonel Clay," he answered, "of the Bengal Staff Corps."

It began to strike us there was something wrong somewhere.

"But he has cheated me, all the same," Charles said—"at Nice two years ago, and many times since; and this very day he has tricked me out of two thousand pounds in French bank-notes, which he has now about him!"

The Colonel was speechless. But the attaché laughed. "What he has done to-day I don't know," he said; "but if it's as apocryphal as what you say he did two years ago, you've a thundering bad case, sir; for he was then in India, and I was out there, visiting him."

"Where are the two thousand pounds?" Charles cried. "Why, you've got them in your hand! You're holding the envelope!"

The Colonel produced it. "This envelope," he said, "was left with me by the man with short stiff hair, who came just before you, and who announced himself as Sir Charles Vandrift. He said he was interested in tea in Assam, and wanted me to join the board of directors of some bogus company. These are his papers, I believe," and he handed them to his cousin.

"Well, I'm glad the notes are safe, anyhow," Charles murmured, in a tone of relief, beginning to smell a rat. "Will you kindly return them to me?"

The attaché turned out the contents of the envelope. They proved to be prospectuses of bubble companies of the moment, of no importance.

"Medhurst must have put them there," I cried, "and decamped with the cash."

Charles gave a groan of horror. "And Medhurst is Colonel Clay!" he exclaimed, clapping his hand to his forehead.

"I beg your pardon, sir," the Colonel interposed. "I have but one personality, and no aliases."

It took quite half an hour to explain this imbroglio. But as soon as all was explained, in French and English, to the satisfaction of ourselves and the juge d'instruction, the real Colonel shook hands with us in a most forgiving way, and informed us that he had more than once wondered, when he gave his name at shops in Paris, why it was often received with such grave suspicion. We instructed the police that the true culprit was Medhurst, whom they had seen with their own eyes, and whom we urged them to pursue with all expedition. Meanwhile, Charles and I, accompanied by the Colonel and the attaché—"to see the fun out," as they said—called at the Bank of France for the purpose of stopping the notes immediately. It was too late, however. They had been presented at once, and cashed in gold, by a pleasant little lady in an American costume, who was afterwards identified by the hotel-keeper (from our description) as his lodger, Mme. Picardet. It was clear she had taken rooms in the same hotel, to be near the Indian Colonel; and it was she who had received and sent the letters. As for our foe, he had vanished into space, as always.

Two days later we received the usual insulting communication on a sheet of Charles's own dainty note. Last time he wrote it was on Craig-Ellachie paper: this time, like the wanton lapwing, he had got himself another crest.

"MOST PERSPICACIOUS OF MILLIONAIRES!—Said I not well, as Medhurst, that you must distrust everybody? And the one man you never dreamt of distrusting was—Medhurst. Yet see how truthful I was! I told you I knew where Colonel Clay was living—and I did know, exactly. I promised to take you to Colonel Clay's rooms, and to get him arrested for you—and I kept my promise. I even exceeded your expectations; for I gave you two Colonel Clays instead of one—and you took the wrong man—that is to say, the real one. This was a neat little trick; but it cost me some trouble.

"First, I found out there was a real Colonel Clay, in the Indian Army. I also found out he chanced to be coming home on leave this season. I might have made more out of him, no doubt; but I disliked annoying him, and preferred to give myself the fun of this peculiar mystification. I therefore waited for him to reach Paris, where the police arrangements suited me better than in London. While I was looking about, and delaying operations for his return, I happened to hear you wanted a detective. So I offered myself as out of work to my old employer, Marvillier, from whom I have had many good jobs in the past; and there you get, in short, the kernel of the Colonel.

"Naturally, after this, I can never go back as a detective to Marvillier's. But, on the large scale on which I have learned to work since I first had the pleasure of making your delightful acquaintance, this matters little. To say the truth, I begin to feel detective work a cut or two below me. I am now a gentleman of means and leisure. Besides, the extra knowledge of your movements which I have acquired in your house has helped still further to give me various holds upon you. So the fluke will be true to his own pet lamb. To vary the metaphor, you are not fully shorn yet.

"Remember me most kindly to your charming family, give Wentworth my love, and tell Mlle. Césarine I owe her a grudge which I shall never forget. She clearly suspected me. You are much too rich, dear Charles; I relieve your plethora. I bleed you financially. Therefore I consider myself—Your sincerest friend,

"CLAY-BRABAZON-MEDHURST,

"Fellow of the Royal College of Surgeons."

Charles was threatened with apoplexy. This blow was severe. "Whom can I trust," he asked, plaintively, "when the detectives themselves, whom I employ to guard me, turn out to be swindlers? Don't you remember that line in the Latin grammar—something about, 'Who shall watch the watchers?' I think it used to run, 'Quis custodes custodiet ipsos?'"

But I felt this episode had at least disproved my suspicions of poor Césarine.

VIII
THE EPISODE OF THE SELDON GOLD-MINE

On our return to London, Charles and Marvillier had a difference of opinion on the subject of Medhurst.

Charles maintained that Marvillier ought to have known the man with the cropped hair was Colonel Clay, and ought never to have recommended him. Marvillier maintained that Charles had seen Colonel Clay half-a-dozen times, at least, to his own never; and that my respected brother-in-law had therefore nobody on earth but himself to blame if the rogue imposed upon him. The head detective had known Medhurst for ten years, he said, as a most respectable man, and even a ratepayer; he had always found him the cleverest of spies, as well he might be, indeed, on the familiar set-a-thief-to-catch-a-thief principle. However, the upshot of it all was, as usual—nothing. Marvillier was sorry to lose the services of so excellent a hand; but he had done the very best he could for Sir Charles, he declared; and if Sir Charles was not satisfied, why, he might catch his Colonel Clays for himself in future.

"So I will, Sey," Charles remarked to me, as we walked back from the office in the Strand by Piccadilly. "I won't trust any more to these private detectives. It's my belief they're a pack of thieves themselves, in league with the rascals they're set to catch, and with no more sense of honour than a Zulu diamond-hand."

"Better try the police," I suggested, by way of being helpful. One must assume an interest in one's employer's business.

But Charles shook his head. "No, no," he said; "I'm sick of all these fellows. I shall trust in future to my own sagacity. We learn by experience, Sey—and I've learned a thing or two. One of them is this: It's not enough to suspect everybody; you must have no preconceptions. Divest yourself entirely of every fixed idea if you wish to cope with a rascal of this calibre. Don't jump at conclusions. We should disbelieve everything, as well as distrust everybody. That's the road to success; and I mean to pursue it."

So, by way of pursuing it, Charles retired to Seldon.

"The longer the man goes on, the worse he grows," he said to me one morning. "He's just like a tiger that has tasted blood. Every successful haul seems only to make him more eager for another. I fully expect now before long we shall see him down here."

About three weeks later, sure enough, my respected connection received a communication from the abandoned swindler, with an Austrian stamp and a Vienna post-mark.

"MY DEAR VANDRIFT.—(After so long and so varied an acquaintance we may surely drop the absurd formalities of 'Sir Charles' and 'Colonel.') I write to ask you a delicate question. Can you kindly tell me exactly how much I have received from your various generous acts during the last three years? I have mislaid my account-book, and as this is the season for making the income tax return, I am anxious, as an honest and conscientious citizen, to set down my average profits out of you for the triennial period. For reasons which you will amply understand, I do not this time give my private address, in Paris or elsewhere; but if you will kindly advertise the total amount, above the signature 'Peter Simple,' in the Agony Column of the Times, you will confer a great favour upon the Revenue Commissioners, and also upon your constant friend and companion, CUTHBERT CLAY,

"Practical Socialist."

"Mark my word, Sey," Charles said, laying the letter down, "in a week or less the man himself will follow. This is his cunning way of trying to make me think he's well out of the country and far away from Seldon. That means he's meditating another descent. But he told us too much last time, when he was Medhurst the detective. He gave us some hints about disguises and their unmasking that I shall not forget. This turn I shall be even with him."

On Saturday of that week, in effect, we were walking along the road that leads into the village, when we met a gentlemanly-looking man, in a rough and rather happy-go-lucky brown tweed suit, who had the air of a tourist. He was middle-aged, and of middle height; he wore a small leather wallet suspended round his shoulder; and he was peering about at the rocks in a suspicious manner. Something in his gait attracted our attention.

"Good-morning," he said, looking up as we passed; and Charles muttered a somewhat surly inarticulate, "Good-morning."

We went on without saying more. "Well, that's not Colonel Clay, anyhow," I said, as we got out of earshot. "For he accosted us first; and you may remember it's one of the Colonel's most marked peculiarities that, like the model child, he never speaks till he's spoken to—never begins an acquaintance. He always waits till we make the first advance; he doesn't go out of his way to cheat us; he loiters about till we ask him to do it."

"Seymour," my brother-in-law responded, in a severe tone, "there you are, now, doing the very thing I warned you not to do! You're succumbing to a preconception. Avoid fixed ideas. The probability is this man is Colonel Clay. Strangers are generally scarce at Seldon. If he isn't Colonel Clay, what's he here for, I'd like to know? What money is there to be made here in any other way? I shall inquire about him."

We dropped in at the Cromarty Arms, and asked good Mrs. M'Lachlan if she could tell us anything about the gentlemanly stranger. Mrs. M'Lachlan replied that he was from London, she believed, a pleasant gentleman enough; and he had his wife with him.

"Ha! Young? Pretty?" Charles inquired, with a speaking glance at me.

"Weel, Sir Charles, she'll no be exactly what you'd be ca'ing a bonny lass," Mrs. M'Lachlan replied; "but she's a guid body for a' that, an' a fine braw woman."

"Just what I should expect," Charles murmured, "He varies the programme. The fellow has tried White Heather as the parson's wife, and as Madame Picardet, and as squinting little Mrs. Granton, and as Medhurst's accomplice; and now, he has almost exhausted the possibilities of a disguise for a really young and pretty woman; so he's playing her off at last as the riper product—a handsome matron. Clever, extremely clever; but—we begin to see through him." And he chuckled to himself quietly.

Next day, on the hillside, we came upon our stranger again, occupied as before in peering into the rocks, and sounding them with a hammer. Charles nudged me and whispered, "I have it this time. He's posing as a geologist."

I took a good look at the man. By now, of course, we had some experience of Colonel Clay in his various disguises; and I could observe that while the nose, the hair, and the beard were varied, the eyes and the build remained the same as ever. He was a trifle stouter, of course, being got up as a man of between forty and fifty; and his forehead was lined in a way which a less consummate artist than Colonel Clay could easily have imitated. But I felt we had at least some grounds for our identification; it would not do to dismiss the suggestion of Clayhood at once as a flight of fancy.

His wife was sitting near, upon a bare boss of rock, reading a volume of poems. Capital variant, that, a volume of poems! Exactly suited the selected type of a cultivated family. White Heather and Mrs. Granton never used to read poems. But that was characteristic of all Colonel Clay's impersonations, and Mrs. Clay's too—for I suppose I must call her so. They were not mere outer disguises; they were finished pieces of dramatic study. Those two people were an actor and actress, as well as a pair of rogues; and in both their rôles they were simply inimitable.

As a rule, Charles is by no means polite to casual trespassers on the Seldon estate; they get short shrift and a summary ejection. But on this occasion he had a reason for being courteous, and he approached the lady with a bow of recognition. "Lovely day," he said, "isn't it? Such belts on the sea, and the heather smells sweet. You are stopping at the inn, I fancy?"

"Yes," the lady answered, looking up at him with a charming smile. ("I know that smile," Charles whispered to me. "I have succumbed to it too often.") "We're stopping at the inn, and my husband is doing a little geology on the hill here. I hope Sir Charles Vandrift won't come and catch us. He's so down upon trespassers. They tell us at the inn he's a regular Tartar."

("Saucy minx as ever," Charles murmured to me. "She said it on purpose.") "No, my dear madam," he continued, aloud; "you have been quite misinformed. I am Sir Charles Vandrift; and I am not a Tartar. If your husband is a man of science I respect and admire him. It is geology that has made me what I am to-day." And he drew himself up proudly. "We owe to it the present development of South African mining."

The lady blushed as one seldom sees a mature woman blush—but exactly as I had seen Madame Picardet and White Heather. "Oh, I'm so sorry," she said, in a confused way that recalled Mrs. Granton. "Forgive my hasty speech. I—I didn't know you."

("She did," Charles whispered. "But let that pass.") "Oh, don't think of it again; so many people disturb the birds, don't you know, that we're obliged in self-defence to warn trespassers sometimes off our lovely mountains. But I do it with regret—with profound regret. I admire the—er—the beauties of Nature myself; and, therefore, I desire that all others should have the freest possible access to them—possible, that is to say, consistently with the superior claims of Property."

"I see," the lady replied, looking up at him quaintly. "I admire your wish, though not your reservation. I've just been reading those sweet lines of Wordsworth's—

And O, ye fountains, meadows, hills, and groves,
Forebode not any severing of our loves.

I suppose you know them?" And she beamed on him pleasantly.

"Know them?" Charles answered. "Know them! Oh, of course, I know them. They're old favourites of mine—in fact, I adore Wordsworth." (I doubt whether Charles has ever in his life read a line of poetry, except Doss Chiderdoss in the Sporting Times.) He took the book and glanced at them. "Ah, charming, charming!" he said, in his most ecstatic tone. But his eyes were on the lady, and not on the poet.

I saw in a moment how things stood. No matter under what disguise that woman appeared to him, and whether he recognised her or not, Charles couldn't help falling a victim to Madame Picardet's attractions. Here he actually suspected her; yet, like a moth round a candle, he was trying his hardest to get his wings singed! I almost despised him with his gigantic intellect! The greatest men are the greatest fools, I verily believe, when there's a woman in question.

The husband strolled up by this time, and entered into conversation with us. According to his own account, his name was Forbes-Gaskell, and he was a Professor of Geology in one of those new-fangled northern colleges. He had come to Seldon rock-spying, he said, and found much to interest him. He was fond of fossils, but his special hobby was rocks and minerals. He knew a vast deal about cairngorms and agates and such-like pretty things, and showed Charles quartz and felspar and red cornelian, and I don't know what else, in the crags on the hillside. Charles pretended to listen to him with the deepest interest and even respect, never for a moment letting him guess he knew for what purpose this show of knowledge had been recently acquired. If we were ever to catch the man, we must not allow him to see we suspected him. So Charles played a dark game. He swallowed the geologist whole without question.

Most of that morning we spent with them on the hillside. Charles took them everywhere and showed them everything. He pretended to be polite to the scientific man, and he was really polite, most polite, to the poetical lady. Before lunch time we had become quite friends.

The Clays were always easy people to get on with; and, bar their roguery, we could not deny they were delightful companions. Charles asked them in to lunch. They accepted willingly. He introduced them to Amelia with sundry raisings of his eyebrows and contortions of his mouth. "Professor and Mrs. Forbes-Gaskell," he said, half-dislocating his jaw with his violent efforts. "They're stopping at the inn, dear. I've been showing them over the place, and they're good enough to say they'll drop in and take a share in our cold roast mutton;" which was a frequent form of Charles's pleasantry.

Amelia sent them upstairs to wash their hands—which, in the Professor's case, was certainly desirable, for his fingers were grimed with earth and dust from the rocks he had been investigating. As soon as we were left alone Charles drew me into the library.

"Seymour," he said, "more than ever there is a need for us strictly to avoid preconceptions. We must not make up our minds that this man is Colonel Clay—nor, again, that he isn't. We must remember that we have been mistaken in both ways in the past, and must avoid our old errors. I shall hold myself in readiness for either event—and a policeman in readiness to arrest them, if necessary!"

"A capital plan," I murmured. "Still, if I may venture a suggestion, in what way are these two people endeavouring to entrap us? They have no scheme on hand—no schloss, no amalgamation."

"Seymour," my brother-in-law answered in his board-room style, "you are a great deal too previous, as Medhurst used to say—I mean, Colonel Clay in his character as Medhurst. In the first place, these are early days; our friends have not yet developed their intentions. We may find before long they have a property to sell, or a company to promote, or a concession to exploit in South Africa or elsewhere. Then again, in the second place, we don't always spot the exact nature of their plan until it has burst in our hands, so to speak, and revealed its true character. What could have seemed more transparent than Medhurst, the detective, till he ran away with our notes in the very moment of triumph? What more innocent than White Heather and the little curate, till they landed us with a couple of Amelia's own gems as a splendid bargain? I will not take it for granted any man is not Colonel Clay, merely because I don't happen to spot the particular scheme he is trying to work against me. The rogue has so many schemes, and some of them so well concealed, that up to the moment of the actual explosion you fail to detect the presence of moral dynamite. Therefore, I shall proceed as if there were dynamite everywhere. But in the third place—and this is very important—you mark my words, I believe I detect already the lines he will work upon. He's a geologist, he says, with a taste for minerals. Very good. You see if he doesn't try to persuade me before long he has found a coal mine, whose locality he will disclose for a trifling consideration; or else he will salt the Long Mountain with emeralds, and claim a big share for helping to discover them; or else he will try something in the mineralogical line to do me somehow. I see it in the very transparency of the fellow's face; and I'm determined this time neither to pay him one farthing on any pretext, nor to let him escape me!"

We went in to lunch. The Professor and Mrs. Forbes-Gaskell, all smiles, accompanied us. I don't know whether it was Charles's warning to take nothing for granted that made me do so—but I kept a close eye upon the suspected man all the time we were at table. It struck me there was something very odd about his hair. It didn't seem quite the same colour all over. The locks that hung down behind, over the collar of his coat, were a trifle lighter and a trifle grayer than the black mass that covered the greater part of his head. I examined it carefully. The more I did so, the more the conviction grew upon me: he was wearing a wig. There was no denying it!

A trifle less artistic, perhaps, than most of Colonel Clay's get-ups; but then, I reflected (on Charles's principle of taking nothing for granted), we had never before suspected Colonel Clay himself, except in the one case of the Honourable David, whose red hair and whiskers even Madame Picardet had admitted to be absurdly false by her action of pointing at them and tittering irrepressibly. It was possible that in every case, if we had scrutinised our man closely, we should have found that the disguise betrayed itself at once (as Medhurst had suggested) to an acute observer.

The detective, in fact, had told us too much. I remembered what he said to us about knocking off David Granton's red wig the moment we doubted him; and I positively tried to help myself awkwardly to potato-chips, when the footman offered them, so as to hit the supposed wig with an apparently careless brush of my elbow. But it was of no avail. The fellow seemed to anticipate or suspect my intention, and dodged aside carefully, like one well accustomed to saving his disguise from all chance of such real or seeming accidents.

I was so full of my discovery that immediately after lunch I induced Isabel to take our new friends round the home garden and show them Charles's famous prize dahlias, while I proceeded myself to narrate to Charles and Amelia my observations and my frustrated experiment.

"It is a wig," Amelia assented. "I spotted it at once. A very good wig, too, and most artistically planted. Men don't notice these things, though women do. It is creditable to you, Seymour, to have succeeded in detecting it."

Charles was less complimentary. "You fool," he answered, with that unpleasant frankness which is much too common with him. "Supposing it is, why on earth should you try to knock it off and disclose him? What good would it have done? If it is a wig, and we spot it, that's all that we need. We are put on our guard; we know with whom we have now to deal. But you can't take a man up on a charge of wig-wearing. The law doesn't interfere with it. Most respectable men may sometimes wear wigs. Why, I knew a promoter who did, and also the director of fourteen companies! What we have to do next is, wait till he tries to cheat us, and then—pounce down upon him. Sooner or later, you may be sure, his plans will reveal themselves."

So we concocted an excellent scheme to keep them under constant observation, lest they should slip away again, as they did from the island. First of all, Amelia was to ask them to come and stop at the castle, on the ground that the rooms at the inn were uncomfortably small. We felt sure, however, that, as on a previous occasion, they would refuse the invitation, in order to be able to slink off unperceived, in case they should find themselves apparently suspected. Should they decline, it was arranged that Césarine should take a room at the Cromarty Arms as long as they stopped there, and report upon their movements; while, during the day, we would have the house watched by the head gillie's son, a most intelligent young man, who could be trusted, with true Scotch canniness, to say nothing to anybody.

To our immense surprise, Mrs. Forbes-Gaskell accepted the invitation with the utmost alacrity. She was profuse in her thanks, indeed; for she told us the Arms was an ill-kept house, and the cookery by no means agreed with her husband's liver. It was sweet of us to invite them; such kindness to perfect strangers was quite unexpected. She should always say that nowhere on earth had she met with so cordial or friendly a reception as at Seldon Castle. But—she accepted, unreservedly.

"It can't be Colonel Clay," I remarked to Charles. "He would never have come here. Even as David Granton, with far more reason for coming, he wouldn't put himself in our power: he preferred the security and freedom of the Cromarty Arms."

"Sey," my brother-in-law said sententiously, "you're incorrigible. You will persist in being the slave of prepossessions. He may have some good reason of his own for accepting. Wait till he shows his hand—and then, we shall understand everything."