If you like Sherlock Holmes like I like Sherlock Holmes then you will like this Sherlock Holmes who is both like and unlike the Sherlock Holmes we like: A Study in Emerald, by Neil Gaiman.
http://www.neilgaiman.com/exclusive/shortstories/emerald.pdf
It's the seminal A Study in Scarlet, (the first story in which the character of Sherlock Holmes appears), but set in a post-Cthulhu-returns world. Yesss! A short read, with a cool twist. (Not counting the twist wherein the Great Old Ones rule the whole world. Whooo!)
Ye gawkers at the title of this post will best be served by playing the Call of Cthulhu roleplaying game, for which I remember having to create a whole group of characters before the start, due to inevitable, uh, character depreciation. The more you found out, the more your wits slipped through your fingers like runny jello. Just reading a forbidden book could put you in a mental hospital, so it was either go on to solve the mystery as a striped-night-shirt sporting, asylum-escaping, bug-eyed gibbering lunatic (which could actually be pretty entertaining), or pass the torch to your old school chum Phineas Dowd, Ph.D., investigator of the paranormal and crack shot with a pistol.
He just posted the audio for his new Hugo nominated story, How to Talk to Girls at Parties - one of my favs from his most recent collection
http://www.neilgaiman.com/exclusive/shortstories/partiesstory