Supernatural/Horror Fics

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Can anyone point me in the direction of supernatural themed fics of any description for either BBC Sherlock or ACD Canon? It can be something with a rational explanation as per Hound of the Baskervilles - or vampires, werewolves, ghosts, spooky atmosphere, AUs, crossovers, etc. Non-slash only, please!

Thanks in advance for any recs :)