Cecily is a 94-year-old matriarch who lives independently in an old Victorian home in Itasca, Minnesota. A sudden fall forces her into a rehabilitation facility, leaving her physically vulnerable and reliant on her family. This injury triggers vivid memories of her childhood, beginning with her mother abandoning her at a Chicago orphanage in 1924. She carries long-kept secrets from her past, maintaining a fierce independence to protect the conventional family life she built.

Liz is a widow living in Itasca, still actively grieving the sudden death of her husband, Dean, three years prior. She feels overwhelmed by her mother's physical decline and the new demands of caregiving. While packing belongings for Cecily's hospital stay, she discovers a hidden photograph that challenges her understanding of her parents' history. She also manages her own private health crisis, choosing to face it alone to shield her fragile mother.

Molly works as a therapist and raises her teenage son, Caden, as a single mother in Minnesota. She carries emotional weight from past miscarriages and a difficult custody battle following her divorce. The impending visit from her ex-husband creates anxiety, contrasting with the comfort she finds in her grandmother Cecily's guidance. She unwittingly sets a major family discovery in motion by approving a four-generation analysis project.

Kate is a former actress recovering from alcohol addiction following a devastating DUI incident on Christmas Eve. She grieves the sudden death of her husband and struggles with the emotional void left by her estranged father. Staying with her mother in North Carolina, she battles the urge to drink while searching for a sense of belonging and peace.

Clarissa is a 79-year-old woman living in North Carolina. She grew up in a wealthy Kentucky household but was disowned as a young woman when her daughter's darker skin tone revealed a biological secret to her adoptive parents. She maintains a quiet, structured life to manage past traumas. Under pressure from her academically driven daughter, she reluctantly agrees to submit her DNA to a testing service.

Lucky is a young, intelligent Black roustabout working manual labor for a traveling circus in the 1930s. He left his home in Alabama at a young age and writes poetry in his spare time. He operates cautiously in the segregated environment, keenly aware of the racial dangers present in the towns they visit. He connects with people through quiet observations and shared written notes.

Sam is a dedicated physician who uses his profession to intervene in the suffering of others. Driven by memories of his passive mother and abusive father, he makes it his personal mission to rescue patients who have lost hope. He builds a respected, stable life in Itasca, offering advice and care to the entire community while fiercely supporting his family.

Isabelle is the star performer of the Sax & Tebow Circus. Hiding her true identity as a runaway from a wealthy family, she relies on her physical talents and pragmatic arrangements to maintain her privileged status in the performers' hierarchy. She brings a young orphan into her act, offering conditional protection in a harsh environment.

Evan is Molly's ex-husband, currently living in Rhode Island. He maintains a close, long-distance relationship with his son, following his sports career meticulously. Finding local hotels booked, he stays at his former grandmother-in-law's empty house, creating uncomfortable proximity with Molly as they attempt to negotiate custody arrangements.

Lana works as an American Studies professor focusing on racial identity. Raised with a darker skin tone than her family expected, she has spent her life feeling ungrounded and questioning her true parentage. She brings genetic testing kits to a family dinner, determined to uncover the biological facts of her heritage.

Caden is Molly's teenage son and a varsity hockey player. Focused on his academics, he initiates a four-generation analysis for his honors biology project. His scientific curiosity inadvertently sets off a chain of massive family discoveries.

Madeline is a 22-year-old widow struggling with extreme poverty in the 1920s. Desperate for financial security, she surrenders her daughter to an institution, hoping a new suitor will marry her so she can eventually retrieve the child.

Mr. Tebow is the co-owner and operator of the traveling Sax & Tebow Circus. He is a shrewd, exploitative businessman who manages his massive mobile city by treating performers and laborers as assets to be bought, sold, and controlled.

Mrs. Hamilton operates the Chicago orphanage with a cold, businesslike demeanor. She separates children based on financial opportunities, ultimately accepting an envelope of cash in exchange for a child.

Clayburn is an abusive man from a wealthy background. He violently fractured his family upon the birth of his biracial daughter, leaving his wife and children with deep, lasting emotional scars.

Dean was Liz's husband and Molly's father. His sudden death three years before the start of the story casts a long shadow of grief over his wife and daughter, complicating their ability to cope with new family crises.

Grace is a sharp, elegant former nurse who cares for her ailing father. She offers unconditional physical care and emotional validation to a desperate runaway, providing a crucial turning point in the girl's survival.

Dr. Addington directs a lavish but predatory maternity facility. He uses his medical authority to perform non-consensual procedures, manipulating vulnerable young women to serve his own administrative and financial goals.