Here's the thread to speculate about plot directions in Sherlock series 4

It was hard to miss him too much. He made an appearance in two episodes of Season 3.

Whether or not that turns out to be true, that is an epically brilliant piece of fanwankery.

Hmph. Means nothing. Every Doctor Who fan knows: Moffat Lies.

Looks like a Doctor Who crossover :wink:

And another bump.

Filming begins. In Bristol.

[Mycroft]Right. Back to work.[/Mycroft]

Here’s the first solid indication, from Mark Gatiss’s twitter feed, of which Arthur Conan Doyle story will be referenced in the upcoming special. Mark likes to take photos of items on the filming set and post them to give the fans something to squee over.

The Adventure of the Red-Headed League