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" A trailer for the official Sherlock mobile app has been released. Benedict Cumberbatch and Martin Freeman star in the promo clip for Sherlock: The Network.      Both actors - plus Mycroft actor Mark Gatiss - will appear in the app, which allows the user to become part of Sherlock&amp;#039;s homeless network. Fans can virtually navigate their way around London on foot, by tube or by taxi, speaking to witnesses and gathering evidence for ten different cases.  The app - produced by The Project Factory and Hartswood Films - features new exclusively shot video. A fourth and fifth series of Sherlock are currently in the planning stages. Sherlock: The Network app is available to download for iPhone and iPad from the App Store now, priced at \u00A32.99. Sherlock: The Problem of the Vanishing DetectiveSteven Moffat on Sherlock finale twist: &amp;quot;It is not a last-minute whim&amp;quot; "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/sherlock/news/a545111/benedict-cumberbatch-martin-freeman-in-sherlock-app-watch-trailer/>