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Anyone fearing another comedy-heavy episode of Sherlock can rest easy.

The third and final part of the series, His Last Vow, is thrilling and chilling and for me easily the best yet in this run.

The opening scenes contain blackmail, bullying and a shocking change from Sherlock, played by Benedict Cumberbatch.

Doctor Watson, aka Martin Freeman, is off to solve his own little case of sorts and this leads to fights and foul words between him and Sherlock.

There is a fascinating plot and crime clues galore in the opening 15 minutes which will see fans of the more traditional Sherlock episodes yelping with glee.

(Image: BBC)

Sherlock is tasked with helping Lady Elizabeth Smallwood, who is at risk of seeing her family destroyed by media man and all round baddie Charles Augustus Magnussen.

Charles, played by Lars Mikkelsen, is like a brilliant James Bond-style baddie - complete with sinister laugh - who has his fingers in lots of pies.

When Charles clashes with Sherlock over Lady Smallwood's family secrets and another crime closer to home it is a real meeting of the minds.

In fact it is a meeting of two minds who think the same way unlike normal adults.

Charles has an evil streak, he is a scary presence on screen, and Sherlock is up against it to stop him.

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Watson and his wife Mary have a huge part to play in trying to solve this riddle.

But saying more than this would ruin a treat for viewers.

Think helicopters and guns with Sherlock on a bigger scale than ever before.

There is also love, lies, licking and laughing along the way.

BBC Drama Controller Ben Stephenson summed it up at the BAFTA screening when he said there were "mouth dropping twists" and added: "It is really f***ng good."

And though he works for the Beeb, he's not wrong in this case.

Even if you doubted Sherlock over the last two episodes, this is definitely worth a watch.

I think 10 million people will be talking about this in offices across the country on Monday morning.