(For Sherlock) Do you really know ash?

Submitted by AlyssaPhoenix33 

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Sherlock:

Yes, of course I do, I am the author of a monograph upon the subject. This has helped me in multiple cases, though I can't remember the names of all of them off the top of my head.

John (Author's note)

A Study in Scarlet, The Hound of the Baskervilles, The Valley of Fear, The Adventure of the Resident Patient, and The Boscombe Valley Mystery.