I. — THE PUZZLE LOCK

I DO not remember what was the occasion of my dining with Thorndyke at Giamborini's on the particular evening that is now in my mind. Doubtless, some piece of work completed had seemed to justify the modest festival. At any rate, there we were, seated at a somewhat retired table, selected by Thorndyke, with our backs to the large window through which the late June sunlight streamed. We had made our preliminary arrangements, including a bottle of Barsac, and were inspecting dubiously a collection of semi-edible hors d'oeuvres, when a man entered and took possession of a table just in front of ours, which had apparently been reserved for him, since he walked directly to it and drew away the single chair that had been set aslant against it.

I watched with amused interest his methodical procedure, for he was clearly a man who took his dinner seriously. A regular customer, too, I judged by the waiter's manner and the reserved table with its single chair. But the man himself interested me. He was out of the common and there was a suggestion of character, with perhaps a spice of oddity, in his appearance. He appeared to be about sixty years of age, small and spare, with a much-wrinkled, mobile and rather whimsical face, surmounted by a crop of white, upstanding hair. From his waistcoat pocket protruded the ends of a fountain-pen, a pencil and a miniature electric torch such as surgeons use; a silver-mounted Coddington lens hung from his watch-guard and the middle finger of his left hand bore the largest seal ring that I have ever seen.

"Well," said Thorndyke, who had been following my glance,"what do you make of him?"

"I don't quite know," I replied."The Coddington suggests a naturalist or a scientist of some kind, but that blatant ring doesn't. Perhaps he is an antiquary or a numismatist or even a philatelist. He deals with small objects of some kind."

At this moment a man who had just entered strode up to our friend's table and held out his hand, which the other shook, with no great enthusiasm, as I thought. Then the newcomer fetched a chair, and setting it by the table, seated himself and picked up the menu card, while the other observed him with a shade of disapproval. I judged that he would rather have dined alone, and that the personality of the new arrival—a flashy, bustling, obtrusive type of man—did not commend him.

From this couple my eye was attracted to a tall man who had halted near the door and stood looking about the room as if seeking someone. Suddenly he spied an empty, single table, and, bearing down on it, seated himself and began anxiousl