Cumberbitches brace yourself: Sherlock is back on Hong Kong television

As any fan of Sherlock will tell you, the famous sleuth supposedly met his maker in an apparent suicide leap at the end of the second series. Suffice to say, and this hardly warrants a spoiler alert, Sherlock is alive and well and wandering the streets of London; quelle surprise, it was all a big fat con (otherwise the show would now be called Watson, wouldn't it?). Series three begins this week (BBC Entertainment, tomorrow at 9pm) with The Empty Hearse (a play on Arthur Conan Doyle's The Empty House), which sees Holmes trying to rekindle his bromance with the grieving Dr Watson (Martin Freeman; The Hobbit) while dealing with a terrorist cell that's attempting to blow up Parliament.

But never mind that, what we really want to know is: how did Sherlock survive falling off the roof of St Bart's Hospital? We get alternative explanations as to how it could have happened, which provides a great chance to briefly bring back the wonderful Andrew Scott, as Holmes and his nemesis Jim Moriarty grab a quick snog. The rest of the episode, however, is taken up with reintroducing Holmes to Baker Street and his adoring public, and the showboating all gets a little exhausting.

As ever, there is no weak link in the cast and Freeman (above, right, with Cumberbatch) and Dumblesnitch are a match made in heaven. This episode may be lacking in the usual whodunit intrigue but it's certainly good to have them back. It's like they never left.

As we are all aware but sometimes afraid to admit, we spend far too much time online. We are now living (an admittedly more exciting, sexier life) in the digital world and there is no way back. We keep photos and emails in digital files. We do our shopping and banking online. Our phones have become pocket radars to fix our love lives. Our data is precious and tech-savvy cybercriminals want it. Hackers are stealing our money and spying on our secrets. Virtual vandals are destroying our digital lives, governments are eavesdropping (We salute you, Mr Snowden).

Defending us from these new world enemies is a diverse group of elite scientists, experts in extreme physics, maths and ultra-paranoid computing, who are forging unbreakable codes and ultra-fast computers to protect us. Narrated somewhat appropriately by Rupert Penry-Jones (Spooks), Defeating the Hackers (TVB Pearl, Wednesday at 9.30pm) is an in-depth documentary from the Horizon series and investigates how this global geek squad is staying one step ahead of the evil hackers. Be warned though, there's enough computer jargon here to implode a nerd and these shows can make you totally paranoid. I somehow doubt my identity is worth stealing but, just in case, next week's column will be written in chalk, on slate and pigeoned in as I lob my galaxyiberry into the nearest lake and take up residence in a cave. Now, are you sure you logged out of Facebook earlier?