Sep 23, 2014 Updated: 12:28 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
The team tries to stop the sale of nuclear blueprints to Iran by a Russian arms dealer. In other events, Adam kills a journalist whom he mistook for a mugger and meets one last time with Ana.
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