Sep 2, 2014 Updated: 12:59 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
Penhale does his best to keep Maggie from leaving him again. In other events, Martin contemplates registering his son for boarding school and sets a date for the christening without consulting Louisa.
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