“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.

“It was indeed Lestrade, who had ascended the stairs while we were talking, and who now entered the room. The assurance and jauntiness which generally marked his demeanour and dress were, however, wanting. His face was disturbed and troubled, while his clothes were disarranged and untidy. He had evidently come with the intention of consulting with Sherlock Holmes, for on perceiving his colleague he appeared to be embarrassed and put out. He stood in the centre of the room, fumbling nervously with his hat and uncertain what to do. “This is a most extraordinary case,” he said at last— “a most incomprehensible affair.”

“‘Tention!” cried Holmes, in a sharp tone, and the six dirty little scoundrels stood in a line like so many disreputable statuettes. “In future you shall send up Wiggins alone to report, and the rest of you must wait in the street. Have you found it, Wiggins?”