Sir Arthur Conan Doyle
Books
A Study in Scarlet (1887), The Sign of the Four (1890), The Hound of the Baskervilles (1901-02), The Valley of Fear 1914-15), The Adventures of Sherlock Holmes (1891-92), The Memoirs of Sherlock Holmes (1892-93), The Return of Sherlock Holmes (1903-04), His Last Bow (1908-17), The Case Book of Sherlock Holmes (1924-27)
The first grown-up mysteries I read as a were Sir Arthur Conan Doyle'sSherlock Holmes. I can't count the number of times I read and re-read The Complete Sherlock Holmes. It's one of the few volumes I am glad to have in hardback, because otherwise I would have had to replace my volumes several times over.