Features the complete sixth series of the acclaimed drama centering on a team of counter-terrorist spies collectively known as Spooks, because of the shadowy nature of their existence. Technically speaking, Spooks don't even exist. They have no names, identities, or known locations. Yet these secret agents are all that stand between the nation and the terrorists who try to undermine national security. In this series the team are pushed to their limits, as the relationship between British and American security deteriorates and loyalties change.