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Neil Gaiman short story "A Study in Emerald" free at audible.com
ETA: And now, having listened to it, it seems an awful lot like fanfic (which isn't an insult, as I really enjoy fanfic) but it really does seem like Sherlock Holmes and Watson find themselves in an alternate universe where Dracula is real (and advertises!) and the world is run by Illyria's "Old Ones" from "Three Deep" (or, more accurately, run by Cthulhu).
ETA: And now, having listened to it, it seems an awful lot like fanfic (which isn't an insult, as I really enjoy fanfic) but it really does seem like Sherlock Holmes and Watson find themselves in an alternate universe where Dracula is real (and advertises!) and the world is run by Illyria's "Old Ones" from "Three Deep" (or, more accurately, run by Cthulhu).