Set in modern-day London, a group of radical activists take over an energy company’s annual gala, taking 300 hostages in an attempt to expose the corruption of their bosses. Their righteous cause is hijacked by an extremist within their ranks who is ready to kill everyone in the building to send his anarchic message to the world. This involves a former soldier turned window cleaner, played by Daisy Ridley, hanging 50 stories off the outside of a building to save those trapped inside, including her younger brother.