Two of a Kind?

Taking orders again from Arvin Sloane is enough for agent Sydney Bristow''s life to feel turned upside down. But when an old adversary resurfaces and begs specifically for her help, Sydney 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...