Open thread: Does new Sherlock trailer hold clues to 'death' mystery? The advert, which is just 30 seconds long, appears to show actor Benedict Cumberbatch alive and well, walking in to a crowded room. The short clip, broadcast by the BBC on Saturday night and now placed on YouTube, has already been studied intensely by fans, who hope to find clues hidden within it. It marks the much-anticipated return of the detective story, which the BBC promises is "coming soon." It will be broadcast in America on January 19, 2014. The final episode of the last series had seen Sherlock Holmes standing on the roof of St Bartholomew's hospital in central London, telephoning side-kick Dr Watson to bid him farewell. He was then seen leaping from the parapet and striking the pavement, before being carried away without a pulse and bleeding from the head. The new trailer is entitled "#SherlockLives." Series" co-creator Mark Gatiss has already disclosed the title of the first episode will be "The Empty Hearse." One fan who watched the new trailer suggested Holmes could have spiked Watson with a mind-altering drug, which made him believe the detective had jumped from the roof. Another argued Sherlock "pressed the black rubber ball he played with earlier in the episode under his armpit." Do you have your own theory? Please feel free to share it in the open comment section below.