Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation. The title is a popular colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid.
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Top cast
Peter FirthHarry Pearce
Nicola WalkerRuth Evershed
Max BrownDimitri Levendis
Lara PulverErin Watts
William HopeJim Coaver
Alex LanipekunBen Kaplan
Geoffrey StreatfeildCalum Reed
Tom Weston-JonesSasha Gavrik
Alice KrigeElena Gavrik
Jonathan HydeIlya Gavrik
