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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.

  1. David Wolstencroft


Top Billed Cast

  1. Peter Firth

    Peter Firth

    Harry Pearce

  2. Nicola Walker

    Nicola Walker

    Ruth Evershed

  3. Max Brown

    Max Brown

    Dimitri Levendis

  4. Lara Pulver

    Lara Pulver

    Erin Watts

  5. William Hope

    William Hope

    Jim Coaver

Full Cast & Crew

Last Season


Series 10

2011 | 6 Episodes

In the tenth and final series, secrets tumble out when former foes of Harry Pearce during the Cold War fly into London to negotiate a partnership between Russia and the UK.

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Status Ended


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  • 15


    Only those over 15 years are admitted. Nobody younger than 15 can rent or buy a 15-rated VHS, DVD, Blu-ray Disc, UMD or game, or watch a film in the cinema with this rating. Films under this category can contain adult themes, hard drugs, frequent strong language and limited use of very strong language, strong violence and strong sex references, and nudity without graphic detail. Sexual activity may be portrayed but without any strong detail. Sexual violence may be shown if discreet and justified by context.

Type Scripted

Original Language English

Runtime 60m, 58m

Homepage http://www.bbc.co.uk/programmes/b006mf4b



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