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>BBC Radio: Sherlock Holmes - The Valley of Fear The Valley of Fear is the fourth and final Sherlock Holmes novel by Sir Arthur Conan Doyle. It is loosely based .\r<br>\r<br>Dominoes, level 3.
