"How I Live Now" - adapted from a YA novel, it follows the story of an American teen visiting cousins in the UK as tensions are ratcheting up. While there, a terrorist coalition detonates a nuclear device in London, and the country locks down in martial law, and faces a surprisingly robust terrorist opposition. As it's from the perspectives of the teens/kids, a lot of the details you might expect in a movie of this genre (the reason behind the attack, exactly who is responsible, etc) is left out. Not a bad flick, and is streaming on Netflix at the moment.