"1603. A gunpowder mill explodes, causing death and destruction. A passer-by becomes involved in helping victims but is recognised and arrested – for he is a wanted man. The arresting officer is Spymaster Robert Poley, Queen Elizabeth’s Chief Intelligencer under Francis Walsingham and now King James’s under Robert Cecil. The fugitive is the Catholic Robert Catesby. Catesby is imprisoned. On his release, he secretly begins to recruit a group of desperate associates. Some form of a plot - and an act of violence - is afoot. Poley turns his attention towards the conspirators. His intelligencers target an expert in gunpowder and explosives. His name? Guy Fawkes."