The first episode follows the events of the London bombings of July 7, 2005. When four Islamic extremists detonated suicide bombs on three Tube trains and a double-decker bus, killing 52 passengers and injuring hundreds more. Featuring contributions by former Minister for London Tessa Jowell and coroner Dr Paul Knapman, as well as Thelma Stober, who survived the explosion at Aldgate, and Esther Hyman, whose sister Miriam was a victim of the Tavistock Square bus bomb.