Documentary which tells the surprising story of three dedicated individuals who try to protect their Chicago communities from the violence they themselves once perpetrated. These 'interrupters' intervene in conflicts before the incidents explode into violence. Their work and their insights are closely entwined with their own personal journeys, which, as each of them points out, defy easy characterisation.

Shot over the course of a year by acclaimed filmmaker Steve James, it is a vivid portrayal of a city under siege from spiralling violence, including the brutal murder of Derrion Albert, a Chicago high-school student whose death was caught on videotape.