“Indeed?” said Chester, looking at the old man curiously and wondering where he had seen a face something like his before.

“Yes. One of the big sales. There was a priceless copy of one of Marie de Medici’s books in the list, and I fancy it was with a Grolier binding—just his style; but two other people wanted it. I bid up to four hundred and then stopped. A bit of a bibliomaniac, my dear sir, but not book-mad enough to go higher; couldn’t afford it, even for a unique, tall copy. Knocked down for se-ven hun-dred and forty-nine pounds, sir. A fact. Well, did you find your friends whom you were looking for?”

“Yes—no,” said Chester.

“Dear me; but is not that rather contradictory, my dear sir?” said the old man, smiling.

“Perhaps so, but there is a little mystery about the matter, sir,” replied Chester. “By the way, though, can you tell me anything about your next-door neighbours?”

“My next-door neighbours, my dear sir,” said the old man, smiling and rubbing his thin hands together softly; “well, not much, I am so unsociable a body; and here in London one can be so isolated. Let me see, he is something in the House of Commons—a clerk, or master-at-arms, or usher, or something.”

“Mr Clareborough is?” cried Chester, sharply.

“No—no! That is on the other side. Quite a large family party. Very gay people who have plenty of fashionable callers, and carriages, and parties. I fancy they go a great deal to operas and theatres. The confectioner’s people come sometimes, and musicians, and rout seats. Not in my way, my young friend—not in my way,” continued the old gentleman in his quiet, amiable manner, as he took down the great bulky London Directory. “Yes, yes, yes; here we are—Highcombe Street, Clareborough. There’s the name. Very wealthy, gay family, I believe. Clareborough. That’s it, and I think I’ve heard somehow—I don’t quite know how it was, unless one of the tradespeople told me—that they have a fine place somewhere in Kent—The Towers, I think they call it, and they are often down there, and this place is shut up. I like it to be, because it is so much more quiet for a man busy with his books.”

“Have you—have you noticed anything peculiar about the family?” said Chester in a hesitating way.

The old man beamed upon him through his glasses, then took them off deliberately, and wiped each carefully with an old silk handkerchief, gazing at his questioner with his face wrinkled up as if he were puzzled.