Jacob Warburn, nursing a black eye from his confrontation with Roy Pinlow, reflects on his isolation in Portheast. His family’s history as major local employers makes it difficult for him to connect with the townspeople, and he misses the sense of community from the museum group, particularly his connection with Alison Blake. Evelyn sends him a cryptic message asking him to come to the museum but to tell no one.

There, Evelyn and George reveal that his grandmother’s painting is a fake. George confesses that he painted it as a young man in his father’s shop, and his father then sold it to Jacob’s grandfather in 1987, who thought he was getting the real thing. Disappointed, Jacob takes the painting back to his bedsit, where it reminds him of his grandparents’ unhappy marriage and separate bedrooms at Warburn Hall. While examining the frame, he discovers a hidden envelope tucked behind the backing paper. Addressed “To The New Owner,” it is in his grandmother’s handwriting.

Sariah Carnie receives a call from her mother, Grace, who offers a vague apology for Sariah’s unhappy childhood. They arrange to meet at a café in Redruth. There, Grace explains that she and Sariah’s father were very young when Sariah was born and that the situation was complicated by the return of Grace’s 15-year-old sister, Rose, who had been sent away to Plymouth because she was “in trouble.”

Pressed by Sariah, Grace reveals that Rose had been sent to a private home for unwed mothers after becoming pregnant. To avoid scandal, Rose missed Grace’s wedding, and the baby was subsequently put up for adoption. After this partial confession, Grace apologizes for not giving Sariah enough attention and abruptly leaves. While driving back to Portheast, Sariah pieces the timeline together. Struck by a sudden realization, she pulls over, calls her mother, and asks if she was Rose’s baby. Her mother’s silence confirms it.

Evelyn Silver receives a text from Frances Parfait’s caregiver, Samuel, confirming Frances’s willingness to help. Evelyn’s plan is to write address labels for the boxes and arrange their transport to Frances’s flat; after Frances’s death, Samuel will anonymously deliver them to the British Museum, ensuring Evelyn’s involvement remains secret. Frances agrees, adding a kind note about her fond memories of Evelyn and Evelyn’s ex-boyfriend, Asa. Curious, Evelyn finds Asa’s name on a Roman museum’s website but decides against further investigation to avoid reopening old wounds.

Later, Sariah visits Evelyn at Della Dayvon’s shed and confides that her aunt, Rose, is her biological mother. Evelyn offers comfort, understanding the feeling of a life built on a lie. After Sariah leaves, Evelyn researches mother and baby homes and discovers one existed in St Agnes. She realizes Frances may have misheard Edwin Silver refer to the location “St Agnes” as a woman’s name. She texts Frances to ask, but early the next morning, Samuel informs her that Frances has died. The news leaves Evelyn grieving for Frances, her adoptive mother, and the unknown mother who gave birth to her.

Hoping for answers about her birth, Evelyn travels to the village of St Agnes. She enters the local church, where she meets the vicar, a kind woman named Carol. Evelyn explains that she was born in 1964, the year the local mother and baby home closed, and asks to see the baptismal records. Carol helps her search, but they find no entry for an “Evelyn.” Carol explains that babies from the home were often baptized in their adoptive parents’ parishes.

Evelyn then shares her foundling story and shows Carol the piece of lace that was left with her, wondering aloud if she might have been abandoned at that very church. Carol gently dismisses the theory, reasoning that such a dramatic event would have become a part of the church’s local history and would have involved social services. Feeling defeated, Evelyn leaves. On the bus, she begins to suspect her father, a habitual liar, may have fabricated the entire foundling story, leaving her with no real connection to her past.

Jacob reads the letter signed “C W” that was hidden in the painting. She reveals the painting is a fake, purchased by her husband in 1987 as an apology after he failed to reconcile with a former lover. Their marriage was one of convenience, and the fraudulent artwork became a symbol of his deceit. She explains she put it in a jumble sale simply to be rid of it.

Unsettled, Jacob drives to Fowey to check on Michael Bower, the elderly man who contributed to the museum exhibition. A neighbor informs him that Michael is in the hospital after breaking his leg. The neighbor is struggling to care for Michael’s terrier, Max. Unable to turn the dog away, Jacob agrees to foster him. He drives home with Max and later realizes the visit to Michael gives him a perfect excuse to get back in touch with Alison.

Unable to sleep, Sariah recalls a memory of her Aunt Rose visiting shortly before Sariah left home. After a tense, whispered argument with Grace, the family watched a film. Sariah remembers Rose noticing her struggle to braid her own hair and gently taking over, expertly finishing the braid and kissing her on the head. In hindsight, Sariah recognizes the maternal tenderness in the gesture.

She reflects on the situation from Grace’s point of view, understanding that Grace was forced to become a mother prematurely and, in doing so, lost her relationship with her sister. They were both trapped in a family secret. Realizing Grace has been trying to make amends, Sariah gives up on sleep and calls her at 4:00 am. When Grace answers warmly, Sariah feels it is the start of a reconciliation.

With the council’s decision on the boat sheds still pending, Della remains optimistic, planning to launch “The Cake Shed” in partnership with Sariah. Evelyn’s museum is newly organized thanks to George’s help; the controversial diorama on Cornish life is gone, and its mannequins have been donated to a charity shop. Evelyn, however, sees the tidiness as a sign the museum’s end is near.

Sariah visits Evelyn, bringing a cake made from her Grandma Karensa’s recipe. Evelyn tells Sariah about her fruitless trip to St Agnes and dismisses Sariah’s suggestion of a DNA test, preferring to let the past rest. Sariah reveals she has arranged another meeting with Grace and hopes to ask her aunt, Rose, to attend as well. She also hopes Grace will bring their grandmother’s old recipe book to help with the new café venture. As they talk, they are surprised to see Jacob walk past with a small puppy.

Exhausted from caring for the energetic puppy, Max, Jacob picks up Alison for their visit to Michael in the hospital. On the way, Alison reveals she has lost her job but is looking for new work. She also shares that she and her father have been talking more openly since she left her abusive partner, Roy. The museum exhibition prompted them to discuss her grandfather Fred’s secret love for a man named Steven West, and Alison has brought the embroidered sailcloth to return to him, with her father’s agreement. At the hospital, Michael is overjoyed to be reunited with Max.

After the visit, Alison asks Jacob to drive to her to Steven’s house. Jacob waits in the car as Alison approaches a cottage and is greeted by an elderly, snowy-haired man. He watches as she hands over the embroidered cloth, and the man, visibly emotional, invites her inside.

George brings a printer to the museum, insisting that Evelyn create more professional labels to impress the council. Annoyed, Evelyn goes to the newsagents for supplies, where she sees a headline in The Daily Telegraph reporting that a cache of priceless artifacts has been anonymously returned to the British Museum. She picks up one copy, then spots the two remaining on the counter and snatches those up too, paying Jacob for all three.

Back at the museum, she and George read that the police have a “promising lead.” Evelyn is relieved that her plan worked and that Frances’s death means the trail ends with her. George declares it a fresh start for Evelyn and the museum. He argues that her exhibition, despite unearthing painful truths like his forgery and a hidden family affair, ultimately brought the community together. He suggests she curate a new art show to help her fall in love with the museum again, but Evelyn dismisses the idea, stating she has had enough surprises.

Sariah meets Grace at a café. Grace explains the circumstances of Sariah’s adoption: After returning from Plymouth with her baby, Rose was still too young to properly care for her. Grace and her husband took the child for a weekend and, feeling they had failed to protect Rose, decided to raise the baby as their own. The woman from Plymouth who ran the private home helped by claiming to others that she had attended an early home birth as a friend of the family, and the family never spoke of it again.

As Grace finishes, Rose arrives. She is nervous but gives Sariah their Grandma Karensa’s old recipe book. Rose then answers Sariah’s questions, explaining that she chose Sariah’s name and that Sariah’s biological father was a teenage boy who left town before knowing she was pregnant. When it is time to leave, Grace initiates a hug with Rose and then Sariah. Finally, Sariah and Rose share a tentative embrace, giving Sariah hope for their future relationship.