The Essential Guide to Reading the Sherlock Holmes Books
https://reedsy.com/discovery/blog/sherlock-holmes-books
To return to the order of publication, the second novel in the Sherlock Holmes books canon, The Sign of Four, is where Sherlock’s drug use is first depicted and where readers finally begin to see the man behind the detective.This is also the novel where (130-year spoiler alert) Dr. Watson’s future wife, Mary Marston, appears.
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