Steven Moffat

Steven Moffat

The new series of 'Sherlock' will be "devastating".

Executive producer Steven Moffat has teased that the fourth series of the popular detective drama will manage to top the acclaimed third series and his plans even made the show's stars - Benedict Cumberbatch and Martin Freeman - teary-eyed.

He told The Hollywood Reporter: "We have a plan to top it -- and actually I do think our plan is devastating. We practically reduced our cast to tears by telling them the plan.

"Honestly, Mark [Gatiss] and myself are so excited with what we've got coming up, probably more excited than we've ever been about Sherlock. ... Honestly I think we can [top the last season]."

Steven's mysterious plans for Benedict's Sherlock Holmes and Martin's Dr. John Watson follow on from the Series 3 cliffhanger in which the villainous Moriarty - played by Andrew Scott - appeared to return from the dead.

'Sherlock' was a big winner at the 66th annual Primetime Emmy Awards last night (25.08.14), earning both Benedict and Martin golden statues, and Steven admits he is surprised by the show's success in the United States - especially after three series.

He explained: "We've won outside of America ... we were just starting to think that that phase of our lives was dying down because as shows get older they don't win as often -- just like people. We're delighted that we've made it here and hopefully this gets more people watching. That'd be great."