Spooks (2002)

Spooks is set in the shadowy world of MI5, the UK's clandestine security service. Its operators - known as 'spooks' - tackle organised crime, terrorist activities, embassy sieges, weapons proliferation and anarchists, not to mention the conflicts and power struggles back in the office. Prepare to encounter people fiercely loyal to their country, but who lie to their family and friends to protect the nation's security - and their own lives. And remember: despite surface appearances, nothing is as it seems.