Sherlock Holmes

In 1886, newly married and still struggling to make it as an author, Doyle started writing the mystery novel A Tangled Skein. Two years later, the novel was renamed A Study in Scarlet and published in Beeton's Christmas Annual. A Study in Scarlet, which first introduced the wildly popular characters Detective Sherlock Holmes and his assistant, Watson, finally earned Doyle the recognition he had so desired. It was the first of 60 stories that Doyle would pen about Sherlock Holmes over the course of his writing career. Also, in 1887, Doyle submitted two letters about his conversion to Spiritualism to a weekly periodical called Light. 

The prolific author also composed four of his most popular Sherlock Holmes books during the 1890s and early 1900s: The Sign of Four (1890), The Adventures of Sherlock Holmes (1892), The Memoirs of Sherlock Holmes (1894) and The Hound of Baskervilles, published in 1901. In 1893, he had attempted to kill off his Sherlock Holmes character in order to focus more on writing about Spiritualism. However, Doyle reintroduced Sherlock Holmes in The Hound of Baskervilles and later brought him back to life in The Adventure of the Empty House . Doyle also strove to spread his faith through a series of written works, consisting of The New Revolution (1918), The Vital Message (1919), The Wanderings of a Spiritualist (1921) and History of Spiritualism (1926).

In 1928, Doyle's final twelve stories about Sherlock Holmes were published in a compilation entitled The Casebook of Sherlock Holmes.