Kira is shocked since she spent that period of time hiding from the Cardassians in caves during a harsh winter, so she remembers it quite well. At Odo's advice, she contacts her last surviving "cellmate", a Bajoran named Yeln. Much to Kira's surprise, Yeln recognizes her, claiming he thought she was dead after she was dragged away from her cell. Faced with records and witnesses disagreeing with her memories, she decides to go Bajor to get to the bottom of this, with Sisko's blessing. Unknownst to Kira, she is being followed by a mysterious woman.
Some time later, Sisko and Dax are contacted by Alenis who claims that Kira never arrived to meet her and apparently vanished shortly after leaving the spaceport on Bajor. An unconscious Kira is seen awakened by the woman from earlier. Kira looks at a mirror and to her horror she sees she is now a Cardassian!
Accompanying the woman is a Cardassian named Entek who explains she is "home" in Cardassia. Kira naturally believes this to be some sort of set up and vows to tell them nothing but Entek insists he is trying to help her. Entek claims she is not Kira Nerys but rather an undercover operative of the Obsidian Order named Iliana Ghemor, and he is her former trainer. Ten years ago, Iliana volunteered to infiltrate the Bajoran Resistance so the Order kidnapped the real Kira Nerys, surgically altered Iliana to look like her, implanted Kira's memories onto her and sent her back to the Resistance. The room she is held in is not a prison but her father's house. Entek gives Kira a data rod containing a personal statement from Illiana as further proof but Kira refuses to watch it.
Entek "introduces" Kira to Legate Tekeny Ghemor, "her" father. Kira treats him with hostility since her father died fighting the Cardassians. Entek explains to Ghemor that "Iliana's" memories haven't surfaced yet and Ghemor claims that until they do, she is a guest in his home. Ghemor treats Kira warmly, replicating her Bajoran food and assuring her that as a member of Central Command, he can have the Obsidian Order surveillance devices disabled. He apologizes for not having convinced her from going on the mission but she was so determined to serve Cardassia. Kira still believes none of this.
Back on Deep Space 9, Garak reports to Sisko and the crew that a "friend" of his informed him that Kira is being held by the Obsidian Order. Sisko decides to mount a rescue mission, which Garak claims is utterly impossible. Sisko then press gangs Garak into coming along by pointing out that the Bajoran government wants Garak off the station (which would leave him with nowhere safe to go), but Sisko doesn't plan to do that ... yet. Garak begrudgingly accepts.
A couple of days later, Kira still doesn't "remember" anything, despite receiving injections that would supposedly restore her original memories. Entek starts getting more aggressive and attempts to pump Kira for information on Deep Space 9. Kira remains evasive prompting Entek to show further evidence of his claims: he brings out the cryogenically preserved corpse of Kira Nerys (which Kira naturally dismisses as a fake) as well as telling her about a memory of accidentally shooting a mother hara cat which she had never told anyone about, claiming it's a memory he implanted himself. Entek warns Kira that the Order is losing patience with her.
Kira attempts to escape by disabling the window's force field but Ghemor enters claiming that she set off a silent alarm. He also points out that even if she does escape, there's no way she can leave the planet without the Order finding her. Ghemor vows that no one will hurt her and begs Kira to watch the recording Entek gave her. Kira does so and is shocked to see that Iliana looks and sounds exactly like her.
Meanwhile; Sisko, Dax, Odo and Garak are deep into Cardassian space on the Defiant disguised as a Kobheerian freighter. They nearly get their cover blown by a Cardassian Gul demanding them to be stopped and searched but Garak orders him to leave and erase his logs with a complex military code he heard while hemming some trousers.
Entek once again interrogates Kira, who at this point is almost broken and unsure of what to believe. Ghemor orders this to stop and Entek replies that their next interrogation will be at Order headquarters. Ghemor tells Kira that he will help her escape since even if she no longer remembers him, he still loves her.
Ghemor later gives Kira her "mother's" bracelet and introduces her to Ari, who will help her escape the planet. Kira asks how this is possible and they explain that they have friends who think as they do that the Central Command and the Obsidian Order have too much power, which they aim to change. Kira realizes that Ari and Ghemor are part of the Cardassian dissident movement. Ari urges Kira to come along but she cannot believe this is a coincidence...and it hits her: Ghemor is the real target of this charade. The Order exploited Kira's resemblance to Iliana to set up this whole thing in order to expose Ghemor's ties to the dissidents. Kira's suspicions are confirmed when Entek shows up with two armed guards, shoots Ari and gloats that he has exposed a traitor and is about to destroy the dissident movement. Luckily Odo, Garak and Sisko show up in the nick of time and disarm the guards. Entek recognizes Garak and taunts him that until now the Order was willing to let him live his exile in peace but no longer. Entek then tries to draw a hidden weapon but Garak kills him.
Back on Deep Space 9, Kira is Bajoran again and tells Ghemor that Bashir confirmed that all the alterations were surgical and that she is indeed Bajoran. Yeln has gone missing, meaning he was likely a Cardassian agent. Kira asks why go to all the trouble of kidnapping her instead of getting the real Iliana and Ghemor points out that then her memories would return and thus Ghemor wouldn't needed to save her and expose himself. Ghemor still believes Iliana is alive and hopes to find her. The Mathenite government has given Ghemor sanctuary but before he leaves, he gives Kira some "fatherly advice": never trust Garak. He also tells her to keep the bracelet since until Iliana is found, Kira is now the closest thing he has to family. Kira sends him off saying that despite anything she has previously said, that he is an honorable man and his daughter must have loved him very much.
- Ambiguous Situation: In the scene where Entek interrogates Kira and she goes on to smash the mirror, Kira is incredibly withdrawn and uncommunicative. It's left up to the viewer to decide if the situation has pushed her into an existential breakdown or if Entek has shot her full of drugs.
- Amnesiac Dissonance: What Ghemor thinks is going on with Kira.
- Batman Gambit: Entek kidnapping Kira was one to convince Ghemor that his daughter had returned, and would be put in danger of interrogation by the Obsidian Order, so he would try to sneak her off the planet and allow him to reveal Ghemor as leader of the dissident movement.
- Big Damn Heroes: Sisko, Odo, and Garak show up to rescue Kira.
- Blackmail: Sisko gets Garak to cooperate with the rescue mission by threatening to revoke his rights to remain on the station — the only place he's safe from his old colleagues in the Obsidian Order.Garak: Commander, this is extortion!
Sisko: Hmm... (considers for a moment) Yes, it is.
- Body Language: Once she's a prisoner of the Cardassians, Kira
- Bond One-Liner: After Garak vaporizes Entek:Garak: A pity... I rather liked him.
- Chekhov's Gun: Early on, Garak mentions (in his typical oblique way) that he'd likely be assassinated if he tried to leave DS9. This winds up getting used as leverage to pull him into Kira's rescue.
- Contrived Coincidence: Amazingly, Kira looks exactly like a Bajoran version of Iliana would, and even has the same voice. Without this inexplicable resemblance, Entek wouldn't have been able to make Ghemor believe she is his daughter.
- Crazy-Prepared: Entek had a corpse of Kira made in an attempt to convince her. She dismisses it as a fake.
- And an Invoked Trope by Entek to justify why they preserved the corpse in the first place—the Order keep anything that might prove useful in future.
- Double Reverse Quadruple Agent: Lampshaded by Kira with regards to Garak during the rescue.Kira: Don't worry, he's on our side — I think.
- And also by Ghemor at the end, when he warns Kira never to trust Garak even though he helped them, because he'll turn against her in an instant if it was in his interest.
- Eating the Eye Candy: Garak finds a Cardassian Kira quite ravishing.
- "Eureka!" Moment: As Ghemor tries to get Kira off Cardassia and reveals he's part of the dissident movement, she realizes that Ghemor was Entek's real target the entire time.
- Explain, Explain... Oh, Crap!: Kira realizing that the Obsidian Order is using her to arrest Ghemor.
- Fake Memories: The Cardassians say that Kira's memories of her life and youth were implanted, partly real, partly constructed, when she agreed to infiltrate the Bajorans. This turns out to be a lie. While the technology exists, it's actually important to Entek's scheme that Kira not recover her "true" memories as Iliana.
- Foreshadowing: Entek tells Kira early on that if the Obsidian Order wanted information from her, "[they'd] have it already". Then when he interrogates Kira, the questions he asks — the crew personnel of Deep Space 9, the names of the ships in the region, etc — are things the Order surely would be able to find out in less elaborate ways, and it makes no sense to ask such things of "Iliana" when her assignment was to infiltrate Bajor. Both are clues that Kira isn't their real target.
- Funny Background Event: Odo rolling his eyes behind Garak and Sisko when Garak claims that the authority he just wielded as a member of the State Sec was "something he overheard while hemming someone's trousers."
- Holographic Disguise: Sisko uses one to disguise himself as a Kobheerian.
- Identical Stranger: Iliana inexplicably looked and sounded exactly like Major Kira — with different forehead ridges and Cardassian coloring, but still. The Contrived Coincidence goes unexplained.
- Implausible Deniability: When the Defiant is about to be boarded and have its cover blown by a Cardassian ship, Garak drops the holographic overlay they've been using to address the captain:Garak: Gul Benil.Gul Benil: You're not Kobheerians!Garak: Very observant of you. Now turn your ships around.Gul Benil: Excuse me?!Garak: This is an alpha red priority mission, clearance verification 9218-black. By authority of the Central Command, you are ordered to turn your ships around, erase all records of this encounter from your logs, and talk of it to no one! Is that clear?[Gul Benil taps on his computer console]Computer: clearance code verified.Gul Benil: My apologies. I had no idea.Garak: You were doing your duty. End transmission.Sisko: Mr. Garak, I'm impressed.
- Magic Plastic Surgery: Once again, the Cardassians are shown to be extremely proficient at crafting surgical disguises — transforming Kira into a Cardassian between scenes and modifying a corpse to serve as the "real" Kira. Of course, because the Cardassians have used this tactic so often, Kira has every reason to doubt this so-called proof. It then turns out that doubt was exactly what Entek was relying on, to drive Ghemor to extreme lengths to save his daughter from Obsidian Order interrogation.
- Not-So-Well-Intentioned Extremist: Entek claims to be removing threats to Cardassia. Ghemor states he's really out to remove enemies of the Obsidian Order, and Entek responds that the Obsidian Order is Cardassia.
- Rage Against the Reflection: Kira smashes a mirror once the whole facade drives her to a Despair Event Horizon.
- Screw the Rules, I Make Them!: Ghemor believes that he's untouchable despite leading the dissident movement due to his status as a Legate. Sadly he's wrong, Entek having spent the episode ensuring that he could expose and remove him.
- Screw This, I'm Outta Here!: Mentioned as Garak makes it clear to Sisko that if things go badly, he'll cut them loose and let them hang rather than risk his own life.Sisko: Mr. Garak, I believe that's the first completely honest thing you've ever said to me.
- Sheep in Sheep's Clothing: Kira starts out adamant in her belief that Ghemor is on the scheme to make her doubt her own identity and allegiance, as the good cop to Entek's bad cop. She gradually understands he's actually sincere in his belief that she's his daughter, and just as much a victim of the Obsidian Order as her.
- Tomato in the Mirror: Kira, a diehard Bajoran resistance member, wakes up as a Cardassian, and is told she was surgically altered with implanted Fake Memories. This turns out to be an elaborate ruse — Kira, post-Magic Plastic Surgery, just so happens to look and sound exactly like Ghemor's real daughter.
- Was It All a Lie?: It was... but Kira was sure convinced for a while.note
- Wham Shot!: Cardassian Kira!
- What Happened to the Mouse?: Ghemor doesn't find out what happened to his real daughter.