Last night, the hit series Sherlock returned for U.K. viewers on BBC One with "The Empty Hearse", although fans in the U.S. have to wait until January 19 before the Season 3 premiere debuts. Today, the British network has released a trailer for this season's second episode, "The Sign of Three", along with two featurettes that takes you behind-the-scenes with stars Benedict Cumberbatch, Martin Freeman and series creators Steven Moffat and Mark Gatiss. Take a look at these videos to find out what's in store for Sherlock Holmes and Watson in Season 3

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