Episode Overview
The government introduces Draconian emergency measures in response to a series of terrorist attacks. MI5 fears that influential establishment figures are behind the attacks and may be planning a coup.
Guest Stars
Nicola Walker
Ruth Evershed
Rory MacGregor
Colin Wells
Lindsay Duncan
Angela Wells
Gugu Mbatha-Raw
Jenny
Nicholas Jones
Michael Collingwood
Roger Allam
Paul Millington
John Castle
Jocelyn Myers
Alan McKenna
Lee MacKenzie
Roger Ringrose
Gerry Houghton
Simon Woods
Rowan
Robert Glenister
Home Secretary