All the afternoon he sat in the stalls wrapped in the most perfect happiness, gently waving his long, thin fingers in time to the music, while his gently smiling face and his languid, dreamy eyes were as unlike those of Holmes the sleuth-hound, Holmes the relentless, keen-witted, ready-handed criminal agent, as it was possible to conceive.
There are no more uses of "sleuth" in the book.
Show samples from other sources
Jane’s sleuthing efforts had completely failed.
Margaret Peterson Haddix -- Uprising
Eventually, and after a great deal of sleuthing, the police got hold of the rumor circulating in Churchill to the effect that I was a Secret Service agent who had been sent to spy on the floating Russian bases at the pole, and they so reported to Ottawa, adding that they did not like being made mock of, and the next time the Department wanted something found, it had better be honest with them.