In modern-day London, a group of radical activists take over the energy company’s annual gala and take 300 hostages in order to expose the hosts’ corruption. Their just cause is hijacked by an extremist in their ranks who is willing to kill everyone in the building to send his anarchic message to the world. A former soldier turned window cleaner, played by Ridley, hangs the outside of the 50-story building to save those trapped inside, including his younger brother.