Set in modern-day London, a group of radical activists take over an energy company’s annual event and take 300 hostages to expose the corruption of the host company. Their righteous cause is hijacked by an extremist from within their ranks, who is willing to kill everyone in the building to send his anarchic message to the world. It’s the story of a former soldier turned window cleaner, played by Daisy Ridley. She hangs herself 50 stories from the outside of a building to save those trapped there, including her younger brother.