Thorndyke reflected. "No," he said, "I can't say that I have. I turned it over rather carefully when the report first appeared, and I have speculated on it occasionally since. It is my habit, as Jervis was telling you, to utilise odd moments of leisure (such as a railway journey, for instance) by constructing theories to account for the facts of such obscure cases as have come to my notice. It is a useful habit, I think, for, apart from the mental exercise and experience that one gains from it, an appreciable proportion of these cases ultimately come into my hands, and then the previous consideration of them is so much time gained."

"Have you formed any theory to account for the facts in this case?" I asked.

"Yes; I have several theories, one of which I especially favour, and I am waiting with great interest such new facts as may indicate to me which of these theories is probably the correct one."

"It's no use your trying to pump him, Berkeley," said Jervis. "He is fitted with an information-valve that opens inwards. You can pour in as much as you like, but you can't get any out."

Thorndyke chuckled. "My learned friend is, in the main, correct," he said. "You see, I may be called upon any day to advise on this case, in which event I should feel remarkably foolish if I had already expounded my views in detail. But I should like to hear what you and Jervis make of the case as reported in the newspapers."

"There now," exclaimed Jervis, "what did I tell you? He wants to suck our brains."

"As far as my brain is concerned," I said, "the process of suction isn't likely to yield much except a vacuum, so I will resign in favour of you. You are a full-blown lawyer, whereas I am only a simple G.P."

Jervis filled his pipe with deliberate care and lighted it. Then, blowing a slender stream of smoke into the air, he said:

"If you want to know what I make of the case from that report, I can tell you in one word—nothing. Every road seems to end in a cul-de-sac."

"Oh, come!" said Thorndyke, "this is mere laziness. Berkeley wants to witness a display of your forensic wisdom. A learned counsel may be in a fog—he very often is—but he doesn't state the fact baldly; he wraps it up in a decent verbal disguise. Tell us how you arrive at your conclusion. Show us that you have really weighed the facts."