Set in contemporary London, a group of radical activists take over an energy company’s annual gala, taking 300 hostages to expose the corruption of the hosts. Their righteous cause is hijacked by an extremist in their midst, who is willing to murder everyone in the building to send his anarchic message to the world. The case falls to an ex-soldier-turned-window-washer, played by Ridley, who is suspended 50 stories from the outside of the building to rescue those trapped inside, including her younger brother.
