One of the best TV series I have seen. It is a mystery to me why AMC, after presenting breakthrough series after series, killed this smart one off after one season. It has much in common and perhaps the writers took inspiration from (and referenced) Three Days of the Condor, a great '70s spy movie. I guess AMC (and most network TV channels) think that a show has to start out with death, high action, or someone yelling "Stat!". This is a quiet, thoughtful show, which fits the characterizations and near docudrama script perfectly. I loved it and I miss not seeing more, after watching the one and only season. The main thing here is character development, in and out of the office, although the bulk of the story is all about the spying. It did start to take a slower turn in the middle episodes, perhaps a change in some key production area, and it broke the flow a bit. Even so, that is the very worst I can say about it, and that only lasted 2-3 episodes and I was so invested by then it didn't matter. Even though just one season, there are 13 45min episodes that are very worth watching and the story arc is as complete as it can be while leaving room for more in case it was renewed, so it is worth watching as a 13 episode mini-series.