The new president of the United States, after an assassination attempt, has to decide what to do with the nuclear emergency that has been created by terrorist attack."Plan B" is an upcoming American science fiction thriller film directed by Joe Wright and written by Wright and Peter Morgan, based on the 2012 novel of the same name by Robert Harris. The film stars Keira Knightley, Jude Law, and Chiwetel Ejiofor.The new president of the