Being under the command of Arvin Sloane again is enough to turn Agent Sydney Bristow's life upside down. But when an old adversary resurfaces and barters valuable information in return for specifically her help, she is forced to confront ever-changing alliances - and the disturbing question of just how much she and her former enemy have in common. United by an urgent goal but for separate reasons, an inconceivable team is forged. From the luxury hotels of downtown Singapore to the frenetic streets of New Orleans' French Quarter, Sydney finds herself with little time to decide if she's been given the chance to amend ancient history, or if she is being lethally played.