S5, E1: 18 months have passed since the events of Day 4. With the exception of David Palmer, Tony Almeida, Michelle Dessler and Chloe O'Brian, the world believes that Jack Bauer is dead. Jack is living near LA under the name of Frank Flynn, working on an oil rig and living with Diane Huxley and her teenage son, Derek. But an assassin's bullet is about to change all that.