Citadel was an independent global spy agency tasked with upholding the safety and security of all people. Eight years ago, it was destroyed by operatives of Manticore, a powerful syndicate that manipulates the world from the shadows.

With Citadel's fall, elite agents Mason Kane and Nadia Sinh had their memories wiped and narrowly escaped with their lives. Remaining hidden ever since, they have built new lives, unaware of their pasts.

When Mason is tracked down by a former Citadel colleague, desperately needing his help to prevent Manticore from establishing a new world order, he and his former partner embark on a global mission in an effort to stop it.