Nov 23, 2014 Updated: 4:18 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
Aunt Joan's old flame arrives to rekindle their relationship, but his ill health threatens his plans; a teenager develops a crush on Doc when he resets her dislocated shoulder.
Find out about upcoming shows and events. Enter your email address below.