Arthur Conan Doyle's master criminologist Sherlock Holmes continues to delight readers around the world more than a century after he first appeared in print (in 1887's A Study in Scarlet). The digital age has only increased his popularity: amid the onslaught of contemporary crime fiction there is something reassuring about Sherlock Holmes.In the hardcover edition of 'Sherlock Holmes: The Ultimate Collection' you will find all four Sherlock Holmes novels:A Study In Scarlet by Arthur Conan Doyle.The Sign of the Four by Arthur Conan Doyle.The Hound of the Baskervilles by Arthur Conan Doyle.The Valley of Fear by Arthur Conan Doyle.