Dec 13, 2013 Updated: 3:35 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 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.
Find out about upcoming shows, special events, and discounts.