Eight years ago, Citadel fell. The independent global spy agency—tasked to uphold the safety and security of all people—was destroyed by operatives of Manticore, a powerful syndicate manipulating the world from the shadows. With Citadel's fall, elite agents Mason Kane (Richard Madden) and Nadia Sinh (Priyanka Chopra Jonas) had their memories wiped as they narrowly escaped with their lives. For eight years, they have remained hidden, building new lives under new identities, unaware of their pasts. Until one night Mason is tracked down by his former Citadel colleague, Bernard Orlick (Stanley Tucci), who desperately needs his help to prevent Manticore from establishing a new world order. Mason seeks out his former partner, Nadia, and the two spies set off on a mission that takes them around the world in an effort to stop Manticore, all while contending with the dangerous secrets of their pasts.
Richard Madden stars as Mason Kane, alongside Priyanka Chopra Jonas as Nadia Sinh, Stanley Tucci as Bernard Orlick, Lesley Manville as Dahlia Archer, Osy Ikhile as Carter Spence, Ashleigh Cummings as Abby Conroy, and Roland Møller as Anders Silje and Davik Silje.
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The global spy agency Citadel was destroyed by the syndicate, Manticore; since then, Diana Cavalieri, an undercover Citadel agent, is alone, trapped behind enemy lines; the only way out for her is trusting, Edo Zani, the heir of Manticore Italy.
When stuntman Bunny recruits struggling actress Honey for a side gig, they are hurled into a high-stakes world of action, espionage and betrayal. Years later, as their dangerous past catches up, the estranged Honey and Bunny must reunite and fight to protect their young daughter Nadia.