“We telegraphed this morning.”

“How did you word your inquiries?”

“We simply detailed the circumstances, and said that we should be glad of any information which could help us.”

“You did not ask for particulars on any point which appeared to you to be crucial?”

“I asked about Stangerson.”

“Nothing else? Is there no circumstance on which this whole case appears to hinge? Will you not telegraph again?”

“I have said all I have to say,” said Gregson, in an offended voice.

Sherlock Holmes chuckled to himself, and appeared to be about to make some remark, when Lestrade, who had been in the front room while we were holding this conversation in the hall, reappeared upon the scene, rubbing his hands in a pompous and self-satisfied manner.

“ Mr. Gregson,” he said, “I have just made a discovery of the highest importance, and one which would have been overlooked had I not made a careful examination of the walls.”

The little man’s eyes sparkled as he spoke, and he was evidently in a state of suppressed exultation at having scored a point against his colleague.

“Come here,” he said, bustling back into the room, the atmosphere of which felt clearer since the removal of its ghastly inmate. “Now, stand there!”

He struck a match on his boot and held it up against the wall.

“Look at that!” he said, triumphantly.