somewhere near the stairs of his office, and when the opportunity arrives he puts the stones away, spills his chloroform, and makes a smell—possibly sniffs some, and actually goes off on the stairs, and the whole thing's done. He is carried into the office—the diamonds are gone. He tells of the attack on the stairs, as we have heard, and he is believed. At a suitable opportunity he takes his plunder from the hiding-place, and goes home to his lodgings. What is he to do with those diamonds? He can't sell them yet, because the robbery is publicly notorious, and all the regular jewel buyers know him.

"Being a criminal novice, he doesn't know any regular receiver of stolen goods, and if he did would prefer to wait and get full value by an ordinary sale. There will always be a danger of detection so long as the stones are not securely hidden, so he proceeds to hide them. He knows that if any suspicion were aroused his rooms would be searched in every likely place, so he looks for an unlikely place. Of course, he thinks of taking out a panel and hiding them behind that. But the idea is so obvious that it won't do; the police would certainly take those panels out to look behind them. Therefore he determines to hide them in the panels. See here—he took the two pieces of wood with the filled hole from his tail pocket and opened his penknife—the putty near the surface is softer than that near the bottom of the hole; two different lots of putty, differently mixed, perhaps, have been used, therefore, presumably, at different times."

"But to return to Challitt. He makes holes with a centre-bit in different places on the panels, and in each hole he places a diamond, embedding it carefully in putty. He smooths the surface carefully flush with the wood, and then very carefully paints the place over, shading off the paint at the edges so as to leave no signs of a patch. He doesn't do the whole job at once, creating a noise and a smell of paint, but keeps on steadily, a few holes at a time, till in a little while the whole wainscoting is set with hidden diamonds, and every panel is apparently sound and whole."

"But, then—there was only one such hole in the whole lot."

"Just so, and that very circumstance tells us the whole truth. Let me tell the story first—I'll explain the clue after. The diamonds lie hidden for a few months—he grows impatient. He wants the money, and he can't see a way of getting it. At last he determines to make a bolt and go abroad to sell his plunder. He knows he will want money for expenses, and that he may not be able to get rid of his diamonds at once. He also expects that his suddenly going abroad while the robbery is still in people's minds will bring suspicion on him in any case, so, in for a penny in for a pound, he commits a bold forgery, which, had it been successful, would have put him in funds and enabled him to leave the country with the stones. But the forgery is detected, and he is haled to prison, leaving the diamonds in their wainscot setting.

"Now we come to Gavin Kingscote. He must have been a shrewd fellow—the sort of man that good detectives are made of. Also he must have been pretty unscrupulous. He had his suspicions about the genuineness of the diamond robbery, and kept his eyes open. What indications he had to guide him we don't know, but living in the same house a sharp fellow on the look-out would probably see enough. At any rate, they led him to the belief that the diamonds were in the thief's rooms, but not among his movables, or they would have been found after the arrest. Here was his chance. Challitt was out of the way for years, and there was plenty of time to take the house to pieces if it were necessary. So he changed into Challitt's rooms.

"How long it took him to find the stones we shall never know. He probably tried many other places first, and, I expect, found the diamonds at last by pricking over the panels with a needle. Then came the problem of getting them out without attracting attention. He decided not to trust to the needle, which might possibly leave a stone or two undiscovered, but to split up each panel carefully into splinters so as to leave no part unexamined. Therefore he took measurements, and had a number of panels made by a joiner of the exact size and pattern of those in the room, and announced to his landlady his intention of painting her panels with a pretty design. This to account for the wet paint, and even for the fact of a panel being out of the wall, should she chance to bounce into the room at an awkward moment. All very clever, eh?"

"Very."

"Ah, he was a smart man, no doubt. Well, he went to work, taking out a panel, substituting a new one, painting it over, and chopping up the old one on the quiet, getting rid of the splinters out of doors when the booty had been extracted. The decoration progressed and the little heap of diamonds grew. Finally, he came to the last panel, but found that he had used all his new panels and hadn't one left for a substitute. It must have been at some time when it was difficult to get hold of the joiner—Bank Holiday, perhaps, or Sunday, and he was impatient. So he scraped the paint off, and went carefully over every part of the surface—experience had taught him by this that all the holes were of the same sort—and found one diamond. He took it out, refilled the hole with putty, painted the old panel and put it back. These are pieces of that old panel—the only old one of the lot.

"Nine men out of ten would have got out of the house as soon as possible after the thing was done, but he was a cool hand and stayed. That made the whole thing look a deal more genuine than if he had unaccountably cleared out as soon as he had got his room nicely decorated. I expect the original capital for those Stock Exchange operations we heard of came out of those diamonds. He stayed as long as suited him, and left when he set up housekeeping with a view to his wedding. The rest of the story is pretty plain. You guess it, of course?"

"Yes," I said, "I think I can guess the rest, in a general sort of way—except as to one or two points."

"It's all plain—perfectly. See here! Challitt, in gaol, determines to get those diamonds when he comes out. To do that without being suspected it will be necessary to hire the room. But he knows that he won't be able to do that himself, because the landlady, of course, knows him, and won't have an ex-convict in the house. There is no help for it; he must have a confederate, and share the spoil. So he makes the acquaintance of another convict, who seems a likely man for the job, and whose sentence expires about the same time as his own. When they come out, he arranges the matter with this confederate, who is a well-mannered (and pretty well-known) housebreaker, and the latter calls at Mrs. Lamb's house to look for rooms. The very room itself happens to be to let, and of course it is taken, and Challitt (who is the invalid cousin) comes in at night muffled and unrecognisable.

"The decoration on the panel does not alarm them, because, of course, they suppose it to have been done on the old panels and over the old paint. Challitt tries the spots where diamonds were left—there are none—there is no putty even. Perhaps, think they, the panels have been shifted and interchanged in the painting, so they set to work and split them all up as we have seen, getting more desperate as they go on. Finally they realize that they are done, and clear out, leaving Mrs. Lamb to mourn over their mischief.

"They know that Kingscote is the man who has forestalled them, because Gillard (or Jones), in his chat with the landlady, has heard all about him and his painting of the panels. So the next night they set off for