When Layton finally exposes the real killer (a janitor from Third Class who acted out of class rage, not conspiracy), the catharsis is short-lived. Melanie immediately declares the case closed, the killer executed, and Nikki freed—but not to the Tail. To the drawers (the train’s cryo-prison). Justice, such as it is, is a revolving door back to hell. Jennifer Connelly continues to be the show’s secret weapon. In “Justice Never Boarded,” we see Melanie not as a mustache-twirling villain, but as a technocrat drowning in impossible choices. Her scene with Layton after the trial is the episode’s quiet masterpiece. In a sterile engine corridor, she admits, “I don’t care who killed him. I care that the train keeps moving.” It’s the most honest she’s been all season. Connelly plays it with exhausted pragmatism—no malice, just the cold arithmetic of survival. She’s not evil; she’s the system. And the system is evil.

Also, the Tail’s resistance leader (and Layton’s ex-lover), Zarah (Shannon McDonough), is sidelined for most of the runtime. When she finally appears, it’s only to deliver exposition about the Tail’s impatience. The episode could have used more of her sharp, pragmatic fury to balance Layton’s conflicted detective. Grade: A-

But the episode hints at cracks. When Layton accuses her of running a slave ship, her composure flickers. For one frame, you see the woman who once believed in Wilford’s dream, now trapped inside its nightmare. The finale’s reveal (which regular viewers know is coming) is foreshadowed beautifully here: Melanie is not just Wilford’s voice. She is Wilford. And that lie is starting to suffocate her. The subplot featuring Till and her partner, Osweiller (Sam Otto), is the episode’s dark heart. While Layton plays courtroom politics, Till is ordered to “cleanse” the Tail section—a euphemism for breaking up resistance cells. Osweiller, a true believer in order, relishes the brutality. Till, who began the season as a cold instrument of the state, is visibly sickened. Their final scene together—Osweiller beating a Tailie while Till watches—is shot like a horror film. Sumner’s face, half in shadow, conveys a woman realizing she’s on the wrong side of history. It’s a slow-burn redemption arc, and this episode lights the fuse. Where the Episode Stumbles “Justice Never Boarded” isn’t perfect. The actual murder mystery resolution feels rushed—the janitor’s confession comes via a single overheard conversation, which strains credibility. And Ruth (Alison Wright), the fanatical First Class steward, is underused again; her role as Melanie’s conscience is reduced to a few disapproving glances. Given the episode’s focus on justice, her blind loyalty to Wilford’s rules could have offered a fascinating counterpoint.

What makes “Justice Never Boarded” gripping is how it weaponizes the train’s rigid class system as a courtroom. The accused is a Tailie, Nikki Genêt (a brilliantly brittle Katie McGuinness), who had motive (her son was taken by the Folgers) but no real evidence against her. Andre Layton (Diggs), as the train’s only homicide detective, is forced to prosecute her—even though he believes she’s innocent. The moral knot is tight: Layton must betray one of his own to maintain his cover as a First Class passenger, or risk exposing the Tail’s brewing revolution.

The trial scenes are deliberately claustrophobic, shot in tight, sweaty close-ups inside a repurposed baggage car. The show’s production design shines here—the brutalist metal walls, the single hanging light, the way First Class spectators fan themselves with silk programs while Tailies stand in rags. It’s a Kafka nightmare, but with better lighting. Daveed Diggs delivers his finest performance of the season in this episode. Layton is a man being pulled apart: he’s secretly in love with Zarah (the pregnant Tailie who betrayed him), he’s loyal to the Tail’s resistance, but he’s also beginning to see shades of humanity in the “enemy”—particularly in Till (Mickey Sumner), the cynical brakeman who’s becoming an unlikely ally. During the trial, Layton’s cross-examinations are masterclasses in duplicity. He asks questions designed to dismantle the prosecution’s case, but he has to phrase them as if he’s trying to convict. Diggs’s eyes do the real work—every glance toward Nikki is an apology, every pause a silent plea for her to trust him.