Actually some of my favorite who done it were Issac Asimov's Black Widow series of short stories. There are around 60 or so short stores, collected in 4 or 5 books. I don't think they are available in ebook format. Randell Garret's Lord Darcy series is also pretty good (including an amusing take off of Murder on the Orient Express). It's set in an alternate universe, so it's not traditional who done it, but still good. The Omnibus ebook is available.
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