 Season 4 takes place 18 months after Season 3. Jack has been fired by Tony Almeida s replacement, Erin Driscoll, as have most of the agents featured in Season 3, except Chloe O Brian. Jack now works for the Secretary of Defense, James Heller, and is dating his daughter, Audrey Raines. Jack has sworn to put his past behind him, but as a new threat emerges and Jack finds himself on the verge of returning to the life he tried to forget.