A gritty homeless woman is forced to fight for her life when a blood feud between two centuries-old gangs spills onto the doorstep of the home where has been squatting.

When a group of radical activists take over an energy company's annual gala, seizing 300 hostages, an ex-soldier turned window cleaner suspended 50 storeys up on the outside of the building must save those trapped inside, including her older brother.