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Videos: Trailers, Teasers, Featurettes
Sherlock Holmes and Dr. Watson try to track down the Great Mogul, the second-largest diamond in the world.
The Sign of Four streaming: where to watch online?
Currently you are able to watch "The Sign of Four" streaming on Amazon Prime Video. It is also possible to buy "The Sign of Four" on Amazon Video as download or rent it on Amazon Video online.