Sep 19, 2014 Updated: 9:52 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
Julie tells PC Mylow that she's pregnant; Louisa has doubts about moving in with Danny, so Aunt Joan asks Martin to intervene.
Find out about upcoming shows, special events, and discounts.