'Sherlock' will continue to run until fans become bored of the show.
The BBC detective series has received a huge popularity boost in the US after making its debut at famous comic fan convention Comic Con in San Diego, California, and producer Sue Vertue has assured supporters there is plenty of material left in Arthur Conan Doyle's books to keep the show going strong.
Speaking to a crowd of more than 4,000 people who gathered to hear Sue and co-creators Steven Moffat and Mark Gatiss talk about Sherlock's forthcoming third series, she said: "As long as everyone wants to keep on doing it, we'll keep doing it."
Speaking about the late author's novels, Steven added: "They're simply the best stories of all time and make for brilliant TV when TV wasn't even invented yet ... he's covered it all, he's brilliant."
Mark - who also plays Mycroft in the series as well as his executive producing role - thinks one reason why the show is so popular is because fans people are particularly fond of the two main stars, Benedict Cumberbatch (Sherlock Holmes) and Martin Freeman (Dr. John Watson).
He explained: "There's something lovely about Benedict and Martin sitting around a fireplace aged 55 dealing with problems of old age."
Fans of 'Sherlock' - which is also broadcast on PBS in the US - at the event were treated to specially recorded clips from Benedict and Martin, both of whom were unable to attend the spectacle.
Supporters were also given a sneak peak from the new series, which will air in the coming months in the UK and US.
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