It has been two years since Sherlock Holmes faked his death at the end of the BAFTA award-winning series' second season. Fans have since gotten teasers and small tastes of what's to come on January 19th. With this new trailer, Sherlock is set to return to a London's that's changed in his absence. And he'll have to answer to Watson — who watched the fake suicide attempt — making this a potentially uncomfortable reunion.