Viner did his best. His recollections were of a young man of about his own age, about his own height and build, somewhat above the medium; it was his impression, he said, that the man was dressed, if not shabbily, at least poorly; he had an impression, too, that the clean-shaven face which he had seen for a brief moment was thin and worn.

"Got any recollection of his exact look?" inquired the Inspector. "That's a lot to go by."

"I'm trying to think," said Viner. "Yes—I should say he looked to be pretty hard-up. There was a sort of desperate gleam in his eye. And—"

"Take your time," remarked Drillford. "Anything you can suggest, you know—"

"Well," replied Viner. "I'd an idea at the moment, and I've had it since, that I'd seen this man before. Something in his face was familiar. The only thing I can think of is this: I potter round old bookshops and curiosity-shops a good deal—I may have seen this young fellow on some occasion of that sort."

"Anyway," suggested Drillford, glancing over the particulars which he had written down, "you'd know him again if you saw him?"

"Oh, certainly!" asserted Viner. "I should know him anywhere."

"Then that's all we need trouble you with now, sir," said Drillford. "The next business will be—tomorrow."

Viner walked slowly out of the police-station and still more slowly homeward. When he reached the first lamp, he drew out his watch. Half-past twelve! Just two hours ago he had been in his own comfortable library, smiling at Miss Penkridge's ideas about the very matters into one of which he was now plunged. He would not have been surprised if he had suddenly awoke, to find that all this was a bad dream, induced by the evening's conversation. But just then he came to the passage in which the murder had been committed. A policeman was on guard at the terrace end—and Viner, rather than hear any more of the matter, hastened past him and made a circuitous way to Markendale Square.

He let himself into his house as quietly as possible, and contrary to taste and custom, went into the dining-room, switched on the electric light and helped himself to a stiff glass of brandy and soda at the sideboard. When the mixture was duly prepared, he forgot to drink it. He stood by the sideboard, the glass in his hand, his eyes staring at vacancy. Nor did he move when a very light foot stole down the stairs, and Miss Penkridge, in wraps and curl-papers, looked round the side of the door.