The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four .\r<br>\r<br>The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four .\r<br>\r<br>\r<br>\r<br>A Scandal in Bohemia was the first of Arthur Conan Doyles 56 Sherlock Holmes short stories to be published in The Strand Magazine and the first Sherlock .\r<br>\r<br>BBC Radio: Sherlock Holmes - The Valley of Fear (Part 2 - The Tragedy of Belston) The Valley of Fear is the fourth and final Sherlock Holmes novel by Sir Arthur .