TheRusso BrothersCitadeljust wrapped its first season, setting the stage for an internationalspy franchisethatll expand towardmultiple spinoffs.

What Was Nadia Sinh Hiding in ‘Citadel’?

While Manticore tries to kill every Citadel agent in one blow, Mason and Nadia survive.

Richard Madden as Mason Kane/Kyle Conroy in Season 1, Episode 6 of ‘Citadel.'

Image via Prime Video

And as soon as Nadia recovers her memories, we find out she has been hiding something from Mason.

And the reason she does that is because she cant trust Mason.

After Celeste fails to report back for three months, Mason orders her extraction.

Priyanka Chopra Jonas as Nadia Sinh in Season 1, Episode 6 of ‘Citadel.'

Image via Prime Video

During the process, the Oz Key is lost.

As a result, the young agent has her memory wiped out.

Years later, Nadia discovers the truth and cannot forgive Mason for destroying her friends life.

richard madden and priyanka chopra jonas in citadel

So, Nadia breaks up with Mason, and when she finds out shes pregnant, she vanishes.

But if Nadia didnt betray Citadel, who did?

Who Betrayed Citadel?

Lesley Manville as Dahlia Archer in Citadel Season 1.

Image via Prime Video

As the ending ofCitadelreveals, Mason was the agent responsible for Citadels fall.

After spending time with his grandmother, Mason is enlisted by Citadel and trained to be their top agent.

Dahlia agrees to help Mason to find Nadia.

Richard Madden as Mason Kane, with Priyanka Chopra Jonas as Nadia Sinh in the foreground, and Ashleigh Cummings as Abby Conroy in the background.

Image via Prime Video

She also reveals it wasnt terrorists who killed Masons father; it was Citadel.

Dahlia also asks Mason to help her bring Citadel to justice by sharing secret files from the agency.

With Dahlias help, Mason finds Nadia and discovers he has a child with her.

Citadel

Wounded by Nadia hiding the girl, Mason decides to give Dahlia what she wants.

Unfortunately, Dahlia never intended to bring Citadel to justice.

What Did Manticore Want?

Dahlia knows Manticore wont forgive her failure.

Thats why she blows up her own house and stages her suicide.

That means, in future seasons, Dahlia will keep working in the shadows to get revenge.

Or maybe, as an independent agent, she might become an ally against Manticore.

Be it as it may, what intrigues us the most is what happens to Mason next.

Whats Next for Mason Kane?

AtCitadels Season 1 ending, Mason reinjects his memories and discovers who he really was.

So, now, Mason remembers he was the mole who brought Citadel down.

To make matters more complicated, Mason now has all the memories of the love he shared with Nadia.

Furthermore, Mason discovers his wife, Abby, is actually Celeste.

Now, there are two sets of memories inside Masons brain.

He knows about his spy life, his affair with Nadia, and how he destroyed Celestes life.

But he also remembers the loving life he led by the side of Celeste.

The truth, in this case, doesnt set Mason free.

In fact, it traps him in a nightmare.

All episodes ofCitadelSeason 1 are currently available on Prime Video.