6. 'The Americans' (FX)
There's never been a spy thriller anything like The Americans, which just keeps tightening the emotional screws. A nice suburban home in the Eighties is haunted by the family secret: Mom and dad are Soviet spies. Their high-school daughter knows the truth. The FBI agent next door doesn't ... yet. Matthew Rhys and Keri Russell are superb as the couple bonded by espionage as part of their sexual chemistry. And no TV drama uses music so brilliantly – the season-finale moment with Leonard Cohen's "Who by Fire" hits even harder now.