Watch the explosive new Luther trailer and discover who his new sidekick is….

When you've got a nut job running around London who isn't going to stop there's only one man for the job.

Remember, Luther hasn't the cleanest of sheets so he's been taking time out laying low in Dover, Kent for a while. But after being delivered some shocking news and with a serial killer on the loose, he retrieves his rusty, trusty Volvo and heads back to town. And look who has joined Luther in trying to catch the killer, none other than Game of Thrones star Kimberley Henderson (you know nothing, Jon Snow), who plays DS Lane. Something tells us they're going to be a formidable team... Take a look at the trailer below. Luther airs on BBC1 on December 15. https://www.youtube.com/watch?v=vTZvxT03y1U&feature=youtu.be&a