The Adventure of the Red Circle

"Well, Mrs. Warren, I cannot see that you have any particular cause for
uneasiness, nor do I understand why I, whose time is of some value,
should interfere in the matter. I really have other things to engage
me." So spoke Sherlock Holmes and turned back to the great scrapbook
in which he was arranging and indexing some of his recent material.

But the landlady had the pertinacity and also the cunning of her sex.
She held her ground firmly.

"You arranged an affair for a lodger of mine last year," she said--"Mr.
Fairdale Hobbs."

"Ah, yes--a simple matter."