Sherlock creators Steven Moffat and Mark Gatiss, along with producer Sue Vertue, say they are hoping to increase the scale of the show with the upcoming fourth season.

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The upcoming season of crime drama series starring Benedict Cumberbatch will begin filming next year, reported Digital Spy.

"The show has to keep evolving, it has to move on at a pace, I think," Vertue said.

Gatiss said, "What we want to do for a fourth series is match series three, but it's not a question of saying, 'Well we need a baddie on that scale of Charles Augustus Magnussen'.
It's about trying to find stories that have that kind of scale to them."

Series 3 was more character-driven, instead of the standalone crime-solving theme of the previous two. It explored how both Sherlock's (Benedict Cumberbatch) faked suicide and John Watson's (Martin Freeman) marriage affected the dynamic between the pair.