A slow-burning spy thriller set within the British intelligence service during the height of the Cold War, this complex drama is highlighted by Gary Oldman’s acutely understated performance. As a high level agent brought out of retirement to ferret out a mole within the MI5, he exudes intensity and intellect with unerring precision. The story itself is exceptionally complicated and yet highly engaging. I felt that casting and corresponding screen time made it clear whom the mole would turn out to be…but you may disagree.