I was still cogitating on the subject when my colleague returned, followed by the watchful Polton with the tea-tray, and I attacked him forthwith.
"Well, Thorndyke," I said, "I have been thinking about this Blackmore case while you have been gadding about."
"And may I take it that the problem is solved?"
"No, I'm hanged if you may. I can make nothing of it."
"Then you are in much the same position as I am."
"But, if you can make nothing of it, why did you undertake it?"
"I only undertook to think about it," said Thorndyke. "I never reject a case off-hand unless it is obviously fishy. It is surprising how difficulties, and even impossibilities, dwindle if you look at them attentively. My experience has taught me that the most unlikely case is, at least, worth thinking over."
"By the way, why do you want to look over Jeffrey's chambers? What do you expect to find there?"
"I have no expectations at all. I am simply looking for stray facts."
"And all those questions that you asked Stephen Blackmore; had you nothing in your mind—no definite purpose?"