The narrative shifts to Clara’s perspective in the days after her confrontation with Virginia. Clara warns Virginia not to reveal her identity to anyone. Asked whether any living person can confirm her authorship behind the painting, Clara says no. The last place she saw the painting was the cottage in Maine; those with access included Oliver, Violet, and Mrs. Lorette, who managed the cottages. Virginia reasons that the Lorettes must have taken both works to protect the upcoming auction. Clara berates her for surrendering the watercolor so easily.

The next day, Clara reveals that she had already visited the Lorettes’ townhouse only to be turned away by a maid. She now resolves to abandon New York. Virginia invites Clara to meet her at the art school.

At the school, Virginia sets up a canvas, easel, and new supplies as an apology to Clara. Clara dismisses it, insisting she no longer paints and recalling, with quiet grief, how lead poisoning had affected Levon’s painting ability. Virginia responds by talking about Ruby, her divorce, and the friction between them. Her stories motivate Clara to open a paint tube and start marking the canvas. Clara then challenges Virginia to share a secret in return for all the secrets that Clara has revealed to her. Virginia quietly discloses that five years ago she woke from surgery to find she had undergone a mastectomy without forewarning, and has carried the shame of the scar from her surgery ever since. As she continues talking, Clara finds herself painting while she remains absorbed in Virginia’s story.

On a Friday, Clara tries to give Terrence her notice, but cannot manage it before Virginia rushes in: she has spotted a couple on the lower concourse she believes to be the Lorettes. They intercept them at the stairs to the West Balcony, steer the group into a small waiting area, where Clara reveals herself. The Lorettes are skeptical until Clara cites details only a school insider would know. Mr. Lorette shifts immediately to effusive warmth, claiming delight at her survival.

The exchange quickly deteriorates. The Lorettes deny any knowledge of how The Siren ended up at auction, framing their hold on the watercolor as a safeguard over Levon Zakarian’s legacy. Mr. Lorette challenges Clara to produce a living witness who saw her paint the works; she cannot name one. He dismisses the watercolor as inconclusive evidence and calls her a second-rate illustrator, then warns that they will seek legal action if she continues to pester them. A nearby policeman gives the Lorettes the cover to exit, leaving Clara without any viable path forward.

That afternoon, Clara formally gives Terrence her notice. He asks her to stay through the Easter rush, and she agrees to remain for four more weeks before moving back to Arizona.

Virginia spends the weekend feeling frustrated over the Lorette confrontation. On Sunday she tells Ruby everything: Clara’s identity and the Lorettes’ refusal to return her work to her. Ruby raises the possibility of going to the police, but Virginia dismisses it, believing that no officer will arbitrate an art dispute, and neither she nor Clara can afford legal representation.

On Monday, Clara ignores Virginia at work. Virginia follows her to the art school at lunch, where they argue. Virginia challenges Clara’s sense of victimhood, pointing out that she could have stepped forward after the crash rather than vanishing. Clara defends her years living as Totto, citing her independence as a teacher, her love affairs, and the freedom of her art from professional competition. When Virginia asks how she can make amends, Clara asks her to pose nude for a painting.

After hesitation, Virginia undresses on the model stand, exposing her mastectomy scar to the cold room. As Clara sketches in quiet focus, Virginia settles into an unexpected calm. The session is interrupted when three suited inspectors enter, scouting the site to plan for proposed tower. Virginia scrambles to cover herself while Clara confronts the men. They confiscate Clara’s key before leaving and are audibly amused with what they found. Virginia weeps, convinced the men have seen and judged her body. Clara tells her not to care: The evidence of survival on her body is exactly what makes her worth painting.

Clara then leads Virginia through a hidden door to a glass catwalk suspended behind the terminal’s east windows, then up through a series of ladders to a chamber behind the large Tiffany clock on the building’s south facade. They open a panel to find a massive preservationist rally on the street below, with the mayor and Jackie Onassis visible in the crowd. Sunlight floods the chamber. Recalling Jackie’s words about succeeding at the last moment, Virginia forms a plan. The fight for Clara’s legacy is not yet over.

On April 3, 1975, the day The Siren is scheduled for auction, the information booth staff hold a small farewell party for Clara. Virginia arrives late. Unbeknownst to her, Clara has been completing her portrait of Virginia from memory in her hotel room. That evening, Virginia insists Clara join her and Ruby for dinner.

From dinner, Virginia, Ruby, and Clara take a cab to the Sotheby Parke Bernet auction house. Clara, realizing what day it is, refuses to go inside, but Virginia reminds her of the trust she placed in Virginia when she posed for her portrait. Clara relents. Inside, she grows emotional watching works by artists she once knew sell one by one. She also notices Virginia and people in surrounding rows quietly coordinating with one another. When The Siren is placed on the auction block at a starting bid of $70,000, Virginia stands and interrupts the proceedings. She names the painting, accuses the Lorettes of theft, and is challenged by Mr. Lorette rising from the front row.

Virginia then reveals that the people seated around them are relatives of art school alumni whose work the Lorettes had stolen over the years. They stand and raise posters of the stolen artworks in full view of the press photographers. Virginia pulls Clara to her feet and publicly identifies her as Clara Darden, the true artist behind The Siren and the Clyde paintings. Janice from the Art Students League adds that the group has assembled documentation of the Lorettes’ scheme. The auctioneer halts the sale, The Siren is removed, and the Lorettes exit with reporters behind them.

Afterward, Virginia explains that, inspired by the Grand Central rally, she searched the school’s old administrative records for alumni names, worked with Janice to identify which deceased artists appeared in anonymous auction lots, and contacted surviving relatives. Ruby cross-checked Sotheby Parke Bernet catalogs to confirm their findings. As reporters approach Clara, Virginia tells her to take her place in the spotlight.

A police investigation following the auction disruption leads to the Lorettes’ arrest. Mrs. Lorette confesses that she had found The Siren in the attic of the Maine cottage and kept it, as the couple had done with other works taken from students over the years. Given their ages, each received an incarceration sentence of 26 months.

Eight months later, Virginia attends a private MoMA preview of a retrospective honoring Clara Darden as a major 20th-century artist. The show traces her career from early illustrations through The Siren, with the recovered watercolor displayed so that both sides are visible.

Virginia’s life has changed substantially. She holds a full scholarship to a part-time master’s program in art history at New York University, still works a few days a week at the information booth, and is now more deeply involved with the Municipal Art Society. Before going to the retrospective preview, Virginia had presented the Society’s board with a preservation slide show on Grand Central Terminal, featuring Ruby’s photographs of the building’s current condition alongside Clara’s renderings of a fully restored terminal.

Deeper in the gallery, Virginia pauses before a triptych of nudes Clara painted of her, including the one begun during their interrupted session in the art school. The scar is plainly depicted. Virginia finds she is at peace with it.

Adelaide Parsons rushes in with a newspaper: the Appellate Division has voted to reinstate Grand Central’s landmark status, ruling that Penn Central had fraudulently attributed railroad expenses in their records to manufacture a claim of economic hardship. Further appeals are expected, but it is a genuine victory for the preservationist movement. A cheer breaks out across the gallery.

Clara joins Virginia, and they mark the moment together. Virginia reflects that clinging to safety had held her back for years; it was only by taking action that her life changed. She looks ahead to graduate study, new friendships, and a burgeoning romance with a linguistics professor. When Clara asks whether Virginia likes the triptych, Virginia says she loves it. They close the evening wondering what Levon would have made of it all. Clara laughs, theorizing he would have told her she had goats on her roof. Virginia notices Clara’s eyes are full of tears.