Oct 30, 2014 Updated: 9:02 AM
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
MI-5 protects a witness from the associates of a Serbian war criminal, who's on trial. One of the associates is an MI-6 traitor (Alec Newman) who was once Adam's good friend.
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