Sometimes an attack is not a single event. Sometimes people are under siege. In this program, a series of bombings has pushed a large American city to the limits of its nerves when a much more ominous threat emerges: could a massive dirty bomb arrive in the harbor just in time for the Fourth of July? With 5,000 shipping containers landing daily, how many can be examined and how effectively? As the pressure mounts, who comes under suspicion of complicity? For what reasons? How are they investigated, and under what rules of law? When evidence finally points to a specific suspect, how far do we go in an interrogation? With the minutes ticking down and the stakes growing, is torture allowable? Who sets the rules for such an engagement and when are they set? Charles Ogletree, Harvard Law School professor, moderates.