During a handover to the head of counter-terrorism of MI5, Harry Pearce, a terrorist escapes custody. When Harry disappears soon after, his protégé is tasked with finding out what happened as an impending attack on London looms, and eventually uncovers a deadly conspiracy.
Peter Firth
Harry Pearce
Kit Harington
Will Holloway
Elyes Gabel
Adem Qasim
Jennifer Ehle
Geraldine Maltby
Tim McInnerny
Oliver Mace
Tuppence Middleton
June Keaton
Eleanor Matsuura
Hannah Santo
David Harewood
Francis Warrender
Lara Pulver
Erin Watts
Hugh Simon
Malcolm Wynn-Jones
Ronan Summers
Ed Lansbury
Elliot Levey
Philip Emerson
