Sherlock’s Sian Brooke had to audition separately for all four parts before she was told of Eurus Holmes plans
The actress played four parts in the BBC drama - Eurus Holmes, the girl on the bus, John's therapist and Culverton's daughter
SIAN Brooke had no idea she was going to play Eurus Holmes in Sherlock until after she landed the part.
The actress auditioned for three separate roles on the show and it wasn't until she was given the part by showrunners Steven Moffat and Mark Gatiss that she was let into the secret that they were the same part and she would be playing Sherlock's secret sister.
"When I found out I'd got the part I felt exceptionally lucky to be part of something, to join something, that I'd loved for such a long time," she said at the screening of The Final Problem.
"And when I discovered exactly what it was I couldn't quite believe it. I didn't find out until I got the part that I was going to be his sister. It was a revelation!"
The actress played four parts in the BBC drama - Eurus Holmes, the girl on the bus, John's therapist and Culverton's daughter.
Mark Gatiss added: "We got Sian, and a lot of other people to audition as if there were several parts like Faith and the girl on the bus. And then it was only at the eleventh hour that we said, 'Actually, they're all the same person'."
The show will become more like James Bond than ever before in the series finale, showrunner Steven Moffat has revealed.
Critics have attacked the show's latest series for turning Benedict Cumberbatch's portrayal of Sherlock into a James Bond-like figure but the creators of the show aren't bothered and have gone even further with the action scenes in the final episode of the current run.
Last week the reception prompted co-writer and star Mark Gatiss to pen a poem explaining how Sir Arthur Conan Doyle's famous detective had always been a skilled fighter.
And on Thursday, Moffat warned critics and fans the third episode of the fourth series, rumoured to be its last, would be more "actiony" than ever.
Speaking at a fans' and press screening of the episode, set to air on Sunday night, Moffat joked: "For all those complaints being a bit too James Bondy and actiony ... not till tonight."
Moffat also addressed the possibility of the show returning for a fifth series, saying "it could be possible" as he thanked his wife and the show's executive producer, Sue Vertue, for her work on the programme.
He said: "If this was the last one, and we are not planning it to be, but it might be ... If we never come back, and we never do another panel of the show, which is improbable, there is one thing I would like say.
"The boss of Sherlock, the number one person on Sherlock ... it's not me, or Mark, it's the person to whom I'm married."
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Moffat added: "She is the person who runs all of Sherlock. She is the person who either kicks us up the arse or restrains us depending if we're being insane or lethargic.
"She's the person who made us write it in the first place She is the general. She is the chief executive officer. She is the absolutely ultimate boss of this show."
The finale of the BBC1 series airs at 9pm on Sunday.
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