Date of publication: 1890
The Sign of the Four was the second novel featuring Sherlock Holmes.
Plot Summary
The story is set in 1887 or 1888. The Sign of Four has a complex plot involving service in Colonial India, a stolen treasure and a secret pact among four ex-convicts. It presents the detective's drug habit and humanizes him in a way that had not been done in the first novel, A Study in Scarlet. It also introduces Doctor Watson's future wife, Mary Morstan.
(From Wikipedia, description text under GNU Free Documentation License (GFDL))
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