THERE is somewhere in Brompton or Kensington an interminable avenue of tall houses, rich but largely empty, that looks like a terrace of tombs. The very steps up to the dark front doors seem as steep as the side of pyramids; one would hesitate to knock at the door, lest it should be opened by a mummy. But a yet more depressing feature in the grey facade is its telescopic length and changeless continuity. The pilgrim walking down it begins to think he will never come to a break or a corner; but there is one exception�a very small one, but hailed by the pilgrim almost with a shout. There is a sort of mews between two of the tall mansions, a mere slit like the crack of a door by comparison with the street, but just large enough to permit a pigmy ale-house or eating-house, still allowed by the rich to their stable-servants, to stand in the angle. There is something cheery in its very dinginess, and something free and elfin in its very insignificance. At the feet of those grey stone giants it looks like a lighted house of dwarfs.
Anyone passing the place during a certain autumn evening, itself almost fairylike, might have seen a hand pull aside the red half-blind which (along with some large white lettering) half hid the interior from the street, and a face peer out not unlike a rather innocent goblin's. It was, in fact, the face of one with the harmless human name of Brown, formerly priest of Cobhole in Essex, and now working in London. His friend, Flambeau, a semi-official investigator, was sitting opposite him, making his last notes of a case he had cleared up in the neighbourhood. They were sitting at a small table, close up to the window, when the priest pulled the curtain back and looked out. He waited till a stranger in the street had passed the window, to let the curtain fall into its place again. Then his round eyes rolled to the large white lettering on the window above his head, and then strayed to the next table, at which sat only a navvy with beer and cheese, and a young girl with red hair and a glass of milk. Then (seeing his friend put away the pocket-book), he said softly:
