“Tell Her Everything“, the fourth episode of Citadel, dives deeper into the past and the complex web of relationships within the Citadel organization. Mason Kane/Kyle Conroy (Richard Madden) and Nadia Sinh/Charlotte Vernon (Priyanka Chopra Jonas) infiltrate the Manticore Black Site in Morocco, where they encounter Carter Spence (Osy Ikhile), who accuses them of causing the chaos unfolding.
In a flashback, we see Mason and Nadia in Paris, where Nadia introduces a new Tier 1 team member, Celeste Graham. To Mason’s surprise, Celeste is actually Abby Conroy/Brielle (Ashleigh Cummings), who later goes undercover to stop Anders Silje (Roland Møller) from developing a potentially devastating device called the Oz Key.
As Abby immerses herself in the undercover operation, Mason and Nadia grow worried when she goes silent for three months. Mason, suspecting foul play due to Abby’s brother’s gambling problems, sends in an ops team. The operation results in a fight, with Abby and Anders captured, but Davik Silje (also played by Roland Møller) and the Oz Key nowhere to be found.
Mason interrogates Abby, who claims she swapped the Oz Key with a fake, but the real one is missing. Mason threatens Abby’s brother to extract the truth, causing a rift between him and Nadia, who staunchly believes in Abby’s innocence.
To protect Citadel, Mason suggests backstopping (erasing memories and providing a new identity) Abby, a plan Grace (Nikki Amuka-Bird) agrees with. They deceive Abby into thinking she’s undergoing a procedure for changing her cornea and fingerprints. Mason then instructs Bernard Orlick (Stanley Tucci) to wipe Abby’s original memories despite Bernard’s warning about the irreversible consequences.
As Mason and Carter later discuss the missing Oz Key, Carter reveals that Nadia had sent a cloaked order for the Oz Key, implicating her in the conspiracy. Carter’s accusation in the present is not directed towards Mason, but towards Nadia, adding another layer of intrigue and betrayal to the narrative.
