May 23, 2013 Updated: 1:35 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
Zaf infiltrates a British Al Qaeda cell in order to turn one of the members and learns that it's plotting a bomb attack in London.
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