Overall, such a consistently brilliant series. The first three seasons are edge of the seat and keep you guessing, always throwing curveballs and surprising with an unexpected twist or turn, then season 4 takes a bit of a dip, still above average, but subpar for the series as a whole, and season 5 is closer to a return to form, but not quite, with a particularly disappointing final couple of episodes. I'm genuinely shocked this isn't taking the zeitgeist by storm though, it's every bit as brilliant as early Homeland. Surely one of the best, if not the best, TV spy thriller of recent years.