The cast of the BBC show have to keep quiet

Benedict Cumberbatch and the cast of hit BBC show Sherlock are under strict orders to keep silent on what happens in the show’s new series.

The actors have been barred from revealing how Benedict‘s character Sherlock Holmes managed to fake his own death in the last episode, which was broadcast in 2012.

‘If I told you what happens they would kill me. I ¬≠never guessed how the last episode would end. It even surprised me,’ says Andrew Scott, who plays villain Moriarty.

‘It has been fantastic filming the new series but we have all been banned from telling our families or friends what is in the scripts. We are not allowed to speak to anyone.’

The modern imagining of Sir Arthur Conan Doyle‘s much-loved detective stories has proved to be a huge hit since it first appeared on our screens in 2010.

Both Benedict, 36, and Martin Freeman – who plays his sidekick John Watson – have already signed up for another series of Sherlock.

Benedict said in March that he’d ‘love’ to film even more – and he’s not the only one.

‘I don’t think everyone thought it would be so successful,’ Andrew tells the Sunday Mirror.

‘I can see it still on TV in 20 years as we all started working on it very young.’

SEE PICTURES Benedict Cumberbatch‘s life in photos

SEE PICTURES Benedict Cumberbatch shows off his sexy beach body

SEE PICTURES Sexy Benedict Cumberbatch makes catwalk debut at London

Anna Duff