Sherlock and John lock horns with their old enemy – James Moriarty, consultant criminal and evil genius – in one final problem that tests loyalty and courage to their very limits. But this is only the beginning of a complex and deadly scheme with a single goal: the downfall, ruin and obliteration of Sherlock Holmes.

> Pre-order the Series 2 DVD on Amazon.

The Reichenbach Fall, the concluding part of Series 2, airs at 9pm on Sunday 15th January 2012. To whet your appetite, here are ten hints for the episode…

» A certain item of headwear makes a return.

» Stealing the Crown Jewels? There’s an App for that…

» We hope you’ve been paying attention. Something said in A Study in Pink becomes very important.

» Keep an eye out, Sherlock fans, for more than one nod to the Basil Rathbone film The Woman in Green.

» I.O.U.

» The first rule of the Diogenes Club: You do not talk in the Diogenes Club. The second rule of the Diogenes Club: You do not talk in the Diogenes Club.

» James Moriarty, aka, Mr. Sex.

» It’s grim. It’s very Grimm.

» The writing’s on the wall(s). Keep an eye on it.

» Silence will fall.

> Buy the Series 1 DVD on Amazon.

Are you looking forward to The Reichenbach Fall? Let us know below…