Dec 19, 2013 Updated: 9:00 PM
A modern, edgy drama full to the brim with passion, politics and peril. MI-5 leads us into the dangerous world of Britain's top-secret security agency, and into the lives of people who must lie, and sometimes die, for a living.
VISIT THE BBC's MI-5 WEB SITE
The team targets the Tazbekstan trade-and-industry secretary, who refuses to approve a needed energy deal with Britain unless he's allowed to wipe out his enemies on British soil.
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