Former soldier Joey is working as a window cleaner on the exterior wall of a London skyscraper at a height of 300 meters when a group of radical activists led by Marcus take the guests of a gala hostage inside to expose the corruption of an international energy company. Extremists in their own ranks are ready to murder anyone in the building to send their anarchist message to the world. Without the support of the police, Joey is forced to settle the matter himself and free the hostages - including her younger brother.