Willa is a pragmatic, middle-aged magazine editor whose publication recently folded. Facing financial ruin and the loss of her husband's university tenure, she relocates her extended family to a crumbling house inherited from her aunt. She operates as the primary caretaker and crisis manager for her household, constantly worrying about her children's futures and the family's lack of safety net. Despite her exhaustion, she aggressively seeks freelance work and preservation grants to keep them afloat.

Thatcher is a 19th-century high school science teacher who recently relocated to Vineland following his marriage to Rose. Raised in poverty and educated while working for a Civil War surgeon, he possesses a deep passion for biology and Charles Darwin's controversial theories. He feels increasingly isolated in a town that rejects scientific inquiry in favor of rigid traditionalism, finding intellectual companionship only with a select few neighbors.

Mary is an accomplished, self-taught 19th-century botanist living next door to Thatcher Greenwood. She spends her days conducting scientific experiments in her yard, collecting botanical specimens for income, and corresponding with prominent scientists like Charles Darwin. She maintains a fiercely independent lifestyle that defies the conventional gender expectations of her era.

Iano is Willa's optimistic, easygoing husband. A college professor who lost his tenure when his university closed, he accepts a temporary teaching contract to keep his family afloat. He naturally avoids conflict and leaves most of the practical crisis management to his wife, serving as a cheerful counterbalance to her constant anxiety.

Charles Landis is the wealthy real estate baron who founded Vineland as a utopian agricultural community. He controls the town's primary newspaper, dictates local policies, and demands absolute conformity from the residents. He fiercely opposes any ideas that challenge his authority, manipulating public opinion to maintain his supreme status.

Tig is Willa and Iano's 26-year-old daughter. Having recently returned from living abroad, she holds strong anti-capitalist and environmentalist views that frequently clash with her parents' desires for conventional stability. She works low-paying restaurant jobs and prioritizes sustainable living over material success.

Zeke is Willa and Iano's adult son, an ambitious young man burdened by heavy student debt and the unexpected responsibilities of single fatherhood. Following a profound personal tragedy, he attempts to launch an investing start-up in Boston while relying on his family in New Jersey to care for his infant son.

Nick is Iano's elderly, disabled father. A first-generation Greek immigrant, he holds fiercely conservative political views and routinely listens to inflammatory talk radio at high volumes. His failing health requires constant medical attention, forcing his progressive family members to provide intimate care despite his belligerent opinions.

Rose is Thatcher's young, status-conscious wife. Deeply invested in her family's reputation in Vineland, she insists on living in the structurally unsound house built by her late father. She fundamentally disapproves of Thatcher's scientific interests, viewing his controversial teaching methods as a direct threat to her social standing.

Uri publishes the only alternative newspaper in Vineland, actively criticizing Charles Landis's heavy-handed leadership. He stands out as one of the few townspeople willing to question the founder's propaganda, exposing the difficult realities faced by the immigrant laborers who built the town.

Polly is Rose's sister, sharing the crumbling family home with Rose, Thatcher, and their mother. She exhibits a more cheerful, forthright, and open-minded disposition than her sister, occasionally showing quiet sympathy for Thatcher's difficult position within the rigid household.

Rose and Polly's mother is a widow determined to reclaim the social status her family lost when her husband died in severe debt. She openly favors conventional societal rules, supports Charles Landis unconditionally, and frequently dismisses Thatcher's practical concerns about their home's failing foundation.

The head of the Vineland school where Thatcher teaches. He firmly rejects Darwinian theory, insisting that scientific instruction must align entirely with literal religious interpretations of creation. He actively works with town leaders to suppress Thatcher's progressive curriculum.

Chris works as a docent at the local Vineland historical society. He assists Willa in researching the architectural history of her inherited home, searching for evidence that it belonged to a historical figure in order to qualify the property for preservation grants.

Jorge is a local Vineland resident who lives in the property adjacent to Willa and Iano. He works at a restaurant with Tig, shares her interest in sustainable living, and helps the family navigate local issues.

Helene is Zeke's ambitious, career-driven partner who tragically takes her own life shortly after giving birth to their son. An attorney accustomed to an expensive lifestyle, her sudden death forces Zeke and his family to completely restructure their lives to care for the infant she left behind.

Aldus, affectionately nicknamed Dusty, is Zeke and Helene's newborn son. Following his mother's tragic death, he becomes the center of Willa and Tig's daily caregiving routines in the chaotic Vineland house, representing the next generation of the family's legacy.

Dr. Treat is Mary's estranged husband. He abandoned the marriage prior to the start of the narrative, moving away with another woman. His deep involvement in the intuition-based spiritualism movement directly conflicted with his wife's rigorous scientific methodology.