Series 3 is my favorite one:

Two years after the devastating events of The Reichenbach Fall, Dr John Watson has got on with his life.
New horizons and romance beckon in the shape of the beautiful and smart Mary Moristan. But Sherlock Holmes is about to rise from the grave. And even though it's what his best friend wanted more than anything, for John Watson it might well be a case of "be careful what you wish for!"
In three brand new adventures, Sherlock and John face baffling mystery beneath the streets of London - a wedding that's not quite what it seems and the arrival of the repellent and terrifying blackmailer Charles Augustus Magnussen.
Who is the mysterious disappearing man? How can a Royal Guardsman bleed to death in a locked room? And what is the secret that threatens to blow apart everything the reunited friends hold dear?

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