“Not at all. The work is its own reward. Perhaps I shall get the credit also at some distant day, when I permit my zealous historian to lay out his foolscap once more⁠—eh, Watson? Well, now, let us see where this rat has been lurking.”

A lath-and-plaster partition had been run across the passage six feet from the end, with a door cunningly concealed in it. It was lit within by slits under the eaves. A few articles of furniture and a supply of food and water were within, together with a number of books and papers.

“There’s the advantage of being a builder,” said Holmes, as we came out. “He was able to fix up his own little hiding-place without any confederate⁠—save, of course, that precious housekeeper of his, whom I should lose no time in adding to your bag, Lestrade.”

“I’ll take your advice. But how did you know of this place, Mr. Holmes?”