Mr. Sleuth

Definition and stakes

Mrs. Belloc Lowndes,  The Lodger (1911)

“ The cause of the trouble is quite simple. The machine is choked up with shillings; a foolish plan, so I have always felt it to be."
Mr. Sleuth spoke very pettishly, with far more heat than he was wont to speak; but Mrs. Bunting sympathized with him. She had always suspected those slot-machines to be as dishonest as if they were human. It was dreadful, the way they swallowed up the shillings!
”
Source: Wikisource

Old Sleuth,  The "Dock Rats" of New York; Or…

“ Mr. Selton proved to be a very wealthy man, living in a
Western city, and Renie was taken to her grand home.
Meantime, Vance remained in New York to appear as a witness against the band of conspirators, and the result of his labors was the breaking up of one of the best organized smuggling schemes that was ever attempted in America.
When our hero's duties were over, upon invitation he went to pay a visit to Mr. Selton and his daughter, and there's a certain rumor in the air; but as yet we are not permitted to record that another of our heroes has hooked on to one of our heroines
”
Source: Gutenberg

Old Sleuth,  Two Wonderful Detectives; Or, Jack and Gil's Marvelous Skill

“ Our hero knew that the old man must have had some money; there was a little side mystery in none being found on his person, but a clue had been obtained—a very startling one—and Jack was delighted with his success thus far, but he little dreamed of the many strange and conflicting incidents he was destined to be called upon to unravel.
Jack held a long talk with Mr. Douglas, only partially explaining his purpose, and finally succeeded in getting the old man to consent to loan him the clothes. Our hero had formed a very novel and startling plan to make his identification complete.
”
Source: Gutenberg

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