As Hastings's secrets are laid bare, Kate and Steve are torn between loyalty and their duty to uncover the truth. Will the identity of "H" be revealed at last?
Director:
Jed Mercurio
Daniel Nettheim
Cast:
Martin Compston
Vicky McClure
Kelly Macdonald
Shalom Brune-Franklin
Adrian Dunbar
Perry Fitzpatrick
Nigel Boyle
Richard Pepple
Taj Atwal
Rochenda Sandall
Stephen Graham
Aiysha Hart
Andrea Irvine
Polly Walker
Gaite Jansen
Paul Higgins
Lee Ingleby
Jason Watkins
Thandie Newton
Maya Sondhi
Keeley Hawes
Neil Morrissey
Lennie James
Kate Ashfield