Bernard Samson is an aging British spy, who was once at the top of his game. He led his own spy team in East Germany from Berlin. Everything changed when he lost a team member and he's been blaming himself for it ever since. He now works behind the desk with a team of young highly educated spies, who've never seen a day of action. When evidence of a Russian mole within their ranks appear, he's asked once again to return to Berlin and use his experience and old contacts to help catch the traitor.