City Of Ember

City of Ember is a 2008 science fiction fantasy film based on the 2003 novel of the same name by Jeanne DuPrau. It was directed by Gil Kenan from a screenplay by Caroline Thompson, and stars Saoirse Ronan, Harry Treadaway, Bill Murray, Mackenzie Crook, Martin Landau and Tim Robbins.

Plot

In the midst of a nuclear war, the Builders of the underground "City of Ember" place secret instructions to future generations in a small box. They agree that 200 years should be a reasonable margin of safety to stay underground. The box is thrust into the hands of the mayor of the underground complex. Each mayor, in turn, passes the box onto his or her successor. When the box has 47 more years left on the time-lock, the mayor holding the box dies suddenly.