You can find a Sherlock Holmes book in just about any bookstore. But when you buy an interactive digital book called a "vook," you get the " Sherlock Holmes Experience."

So says Vook Inc., which offers digital books that combine video, text, photos and social sharing. Its Sherlock Holmes vook, for instance, features two classic stories by Sir Arthur Conan Doyle - "The Man with the Twisted Lip" and "The Adventure of the Speckled Band" - and enhances them with videos that delve into the history and legend surrounding the character...