We may have a long wait in store until Sherlock returns - the third run of episodes don't even start shooting until January - but today from 3.30pm onwards, we'll get our first few hints at what to expect.

Series co-creators Steven Moffat and Mark Gatiss, producer Sue Vertue, plus one or two cast members will be in attendance at this year's Edinburgh TV Festival Masterclass to reveal the three themes of the new episodes.

How did Sherlock (Benedict Cumberbatch) escape death? How can Moffat, Gatiss and fellow writer Steve Thompson hope to best the Fall? And what is it that makes those Baker Street sleuths so darn appealing?

Digital Spy will be live-blogging the Sherlock Masterclass to bring you all the scoop, as it happens, direct from Edinburgh!

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