How many Sherlock Holmes of Conan Doyle are there?

Conan Doyle's Sherlock Holmes had a total of four works: The first volume of The Complete Works of Sherlock Holmes was published in 1889. The first, second and third volumes of Mysteries of the House of Holmes were published in 1892. The Cabinet Murder, The Red-Letter Society, The Missing Bess Greenwich, Three Cups of Turano, The Black Treasure, published in 1894. The first volume of The End of the World was published in 1895.