Following his shock election victory, Tom Dawkins launches an enquiry into the toxicology anomalies at the blast in Scarrow.
As British intelligence locates the whereabouts of al-Qaeda chief Tamin al-Ghamdi, a reluctant Dawkins is pressed to take him out.
Meanwhile, after her superiors at GCHQ fail to take her findings seriously, Agnes reaches out to the one man she thinks could help her.
Casts:
Gabriel Byrne, Ralph Ineson, Charles Dance, Rupert Graves, Gina McKee, Jamie Sives, Sylvestra Le Touzel, Lia Williams, Anna Madeley, Ruth Negga, Al Weaver, Stephen Dillane, Douglas Hodge, Nicholas Farrell, Kika Markham, Anton Lesser, Jason Done, Nicholas Woodeson, Julian Firth, Sophie Ward