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The Incredulity of Father Brown into large twilit rooms which but for their lines of dark pictures and dusty bookshelves, might have been the traditional dungeons beneath the castle moat. Here and there a candle in an old candlestick lit up some dusty accidental detail of a dead elegance; but the visitor was not so much impressed or depressed by this artificial light as by the one pale gleam of natural light. As he passed down the long room he saw the only window in that wall, a curious low oval window of a late-seventeenth-century fashion. But the strange thing about it was that it did not look out directly on any space of sky but only on a reflection of sky; a pale strip of daylight merely mirrored in the moat, under the hanging shadow of the bank. Payne had a memory of the Lady of Shallot who never saw the world outside except in a mirror. The lady of this Shallot not only in some sense saw the world in a mirror, but even saw the world upside-down.

"It's as if the house of Darnaway were falling literally as well as metaphorically," said Wood in a low voice, "as if it were sinking slowly into a swamp or a quicksand, until the sea goes over it like a green roof."

Even the sturdy Dr. Barnet started a little at the silent approach of the figure that came to receive them. Indeed, the room was so silent that they were all startled to realize that it was not empty. There were three people in it when they entered: