Though Doyle would eventually and successfully revive Holmes in 1903's "The Adventure of the Empty House", the author had in the meantime devised the idea of disclosing a previously unrecorded case, set around 1889, before the events of "The Final Problem". That unchronicled exploit was The Hound of the Baskervilles, released in book form in 1902 after previously been serialized in the Strand magazine the year before. - See more at: