Darkness seems to be the watchword for Sherlock's fourth series, and there certainly aren't any japes or smiles to be found on the new official image for the next run of episodes, which sees Benedict Cumberbatch and Martin Freeman in a glum mood.
They're also, we notice, not looking at each other – so are we to assume there is some rift between the pair? Probably not (at least no more than usual), though from the sounds of it, both men will be tested in a big way this year.
As is de rigueur for Sherlock, story details are still largely a mystery, though we've been offered the hint words "Thatcher", "Smith" and "Sherrinford" for the new run of episodes, and we know that Toby Jones will be playing one of the great detectives most dangerous enemies, Culverton Smith. We can also expect to see John Watson and Mary (Amanda Abbington) Watson dealing with life as new parents.
Production has wrapped on the new series, but for now we go back to that traditional state of the Sherlock fan... Waiting. Take another look at the most recently trailer to tide you over...