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The Case-Book of Sherlock Holmes is the final set of twelve Sherlock Holmes short stories (56 total) by Arthur Conan Doyle first published in the Strand Magazine between October 1921 - April 1927.

The Case-Book contains three stories not narrated by Dr. Watson, as most Sherlock Holmes stories are. "The Adventure of the Mazarin Stone" is narrated in the third person, since it was adapted from a stage play in which Watson hardly appeared. "The Adventure of the Blanched Soldier" and "The Adventure of the Lion's Mane" are both narrated by Holmes himself, the latter being set after his retirement.

The original chronological order in which the twelve stories in The Case-Book were published is as follows:
    "The Adventure of the Mazarin Stone" (told in third-person)
    "The Problem of Thor Bridge"
    "The Adventure of the Creeping Man"
    "The Adventure of the Sussex Vampire"
    "The Adventure of the Three Garridebs"
    "The Adventure of the Illustrious Client"
    "The Adventure of the Three Gables"
    "The Adventure of the Blanched Soldier" (narrated by Holmes)
    "The Adventure of the Lion's Mane" (narrated by Holmes)
    "The Adventure of the Retired Colourman"
    "The Adventure of the Veiled Lodger"
    "The Adventure of Shoscombe Old Place"

Sir Arthur Conan Doyle (1859-1930) was a Scottish physician and writer, most noted for his stories about the detective Sherlock Holmes, generally considered a milestone in the field of crime fiction, and for the adventures of Professor Challenger. He was a prolific writer whose other works include science fiction stories, plays, romances, poetry, non-fiction and historical novels.

Sherlock Holmes is a London-based "consulting detective" whose abilities border on the fantastic, Holmes is famous for his astute logical reasoning, his ability to adopt almost any disguise, and his use of forensic science skills to solve difficult cases. Holmes, who first appeared in publication in 1887, was featured in four novels and 56 short stories.
Novels: A Study in Scarlet (1887), The Sign of the Four (1890), The Hound of the Baskervilles (1902) and The Valley of Fear (1915).

Short stories: The Adventures of Sherlock Holmes (1892), The Memoirs of Sherlock Holmes (1894), The Return of Sherlock Holmes (1905), His Last Bow (1917) and The Case-Book of Sherlock Holmes (1927).