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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.
First Air Date : May 13, 2002
Last Air date : Oct 23, 2011
Episode : 86 Episode
Season : 10 Season
Runtime: 60:14 minutes
Studio: BBC One
Country: United Kingdom