This is a rough, tough and often very violent picture that sees Game of Thrones star Sean Bean swap doublet and sword for civvies and gun to play a British secret service agent who's ordered to go deep under cover to track down some missing Semtex explosive and the home-grown Islamist suicide cell that possesses it. The title is spy-speak for terrorists with no criminal record who are so unknown to the security services that they're almost impossible to trace and keep tabs on. Bean is his usual gruffly minimalist self, but considering he's the star of the show, he's not on screen a lot - a case of too much terrorist, not enough secret agent. The film certainly has ambition and there are some memorable fight scenes, but it also lacks the extra oomph that could have done for Bean's action-movie career what Taken did for Liam Neeson's.