The Adventures of Sherlock Holmes (ep02) The Red-headed League

Sir Arthur Conan Doyle wrote 4 novels about Sherlock Holmes. (1 - A Study in Scarlet, 2 - The Sign of The Four, 3 - The Hound of the Baskervilles, 4 - The Valley of Fear.
(2) The Adventures of Sherlock Holmes, (12 short stories) followed the novels.
(3) The Memoirs of Sherlock Holmes, (11 stories) followed by
(4) The Return of Sherlock Holmes, 13 stories.
(5) His Last Bow, 8 stories followed by
(6) The Case-book of Sherlock Holmes, 12 stories and finally
(7) The Further Adventures of Sherlock Holmes, 10 stories by the BBC. All other Holmes stories would fall under this banner.

The Adventures of Sherlock Holmes is a collection of twelve short stories by British writer Arthur Conan Doyle, first published on 14 October 1892. These were the first stories published after the four novels. It contains the earliest short stories featuring the consulting detective Sherlock Holmes, which had been published in twelve monthly issues of The Strand Magazine from July 1891 to June 1892. The stories are collected in the same sequence, which is not supported by any fictional chronology. The only characters common to all twelve are Holmes and Dr. Watson and all are related in first-person narrative from Watson's point of view.

In general, the stories in The Adventures of Sherlock Holmes identify, and try to correct, social injustices. Holmes is portrayed as offering a new, fairer sense of justice. The stories were well received, and boosted the subscriptions figures of The Strand Magazine, prompting Doyle to be able to demand more money for his next set of stories.

The first story, "A Scandal in Bohemia", includes the character of Irene Adler, who, despite being featured only within this one story by Doyle, is a prominent character in modern Sherlock Holmes adaptations, generally as a love interest for Holmes. Doyle included four of the twelve stories from this collection in his twelve favorite Sherlock Holmes stories, picking "The Adventure of the Speckled Band" as his overall favorite.

Summary
All of the stories within The Adventures of Sherlock Holmes are told in a first-person narrative from the point of view of Dr. Watson, as is the case for all but four of the Sherlock Holmes stories.

The stories in The Adventures of Sherlock Holmes were dramatized for BBC Radio 4 in 1990–1991 as part of the BBC Sherlock Holmes 1989–1998 radio series, and were adapted as episodes of the radio series The Classic Adventures of Sherlock Holmes (2005–2016). The stories within the collection have also been adapted for many other productions.