This is a very well crafted, complicated and sophisticated story. There are many bumps and turns, and a lot of the time you are left wondering what is going on. All is explained, in a somewhat non-linear way. There are many flashbacks that do not immediately make sense, but do if you pay attention and give the story time to evolve. Everything gets wrapped nicely by the end. But getting there takes a bit of effort.
Strong cast. My only gripe being that Kiefer Sutherland whispers his lines a little too much and unnecessarily so. But what starts out as a strangely grouped of characters moves nicely to a point where there is chemistry. It works well.
This is not a show where you can watch the first couple of episodes and decide. You need to invest and see it through to the end. The whole is greater than the sum of the parts.