I watched this film tonight, streamed it via the service Love Film I've signed up to. It is probably the grimmest film I've seen for a while. It was a good film though, very tense and suspenseful with just the right pacing. The story involved an ex soldier, bomb expert, who begins the film with a home made video of him declaring who he is and that he has planted 3 nuclear bombs in American cities. The story then follows a female FBI agent who is part of a Counter Terrorism Unit and her efforts to find the locations of the bombs. I can't really tell you much more without spoiling it. It's not a film for the fainthearted. Samuel L Jackson plays a central character and the entire cast perform really well. For me, the main theme of the film is the moral ambiguity than can arise for society as a whole when faced with a crisis of extreme proportions. It's very effective. If you can stomach moderate torture scenes, this is a decent film to see.