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.
Top Billed Cast
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.