Enola Holmes and the Mark of the Mongoose by Nancy Springer
My rating: 4 of 5 stars

Enola is insulted by a prospective client, who expected to find Mr. Ragostin, instead of a teen girl, at the Perditorian's office. She gets enough information out of his rants, to get curious and try to find his lost friend. The client turns out to be Ruyard Kipling, and Enola finds herself following clues like a rabid dog, a vigilante gang, a flower seller, and an obscure and experimental precursor of vaccines.

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