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Are you thinking of The Devil in the White City? It wasn't a novel although structured like one. Olmsted is in there quite bit.

https://en.wikipedia.org/wiki/The_Devil_in_the_White_City

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It's not exactly a novel but it's not entirely non-fiction as well. There's a fair bit of liberty taken in the details of Holmes' activities. An excellent read, regardless.

Yes! It was so well written that I thought it was a novel

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