Georgia is a real estate lawyer living in Los Angeles who returns to her family's vineyard two weeks before her scheduled wedding. She abandoned her early childhood dreams of winemaking after witnessing the financial devastation of two bad harvests. She relies heavily on her legal career for stability, wearing pencil skirts and stilettos to project an image of control. She actively avoids addressing her own relationship crisis by interjecting herself into her parents' separation and her brothers' disputes.

Ben is a British-born architect who works primarily in London and does business in the United States. He maintains a polished, seemingly perfect exterior that causes his fiancée to compare his physical appearance to Superman. He purchased a new home in London to share after his wedding. He struggles to balance his planned future with the sudden arrival of a young daughter from a previous relationship.

Dan is a former chemistry professor who purchased untested land in Western Sonoma County in 1979 to start a vineyard. He founded The Last Straw and focuses heavily on the biodynamic synchronization of the soil, vines, and weather. He belongs to a local tasting group called the Cork Dorks. His absolute devotion to producing the perfect vintage often causes him to neglect his domestic responsibilities and his marriage.

Jen is a former cellist who gave up an opportunity to play with a New York symphony to support her husband's winemaking aspirations. She met her husband by accidentally getting into his yellow Volkswagen buggy. She currently works as a local music teacher. She secretly pursues an emotional connection outside her marriage after enduring years of feeling invisible to her husband.

Bobby is a venture capitalist living in San Francisco who serves as the seemingly perfect, reliable son of the Ford family. He bought a local bar to provide employment for his twin brother. He suppresses his emotions regarding a previous miscarriage and fails to give his wife the emotional attention she requires, leading to a breakdown in his marriage.

Finn manages The Brothers' Tavern and takes photographs in his spare time. He acts as the family's rebellious element, occasionally spending nights in the Starkville City Jail for minor offenses. He harbors long-standing affection for his sister-in-law but attempts to distance himself to protect his twin brother's marriage.

Jacob is the chief executive officer of Murray Grant Wines, an international wine company known for prioritizing profits over quality. He arrives in Sebastopol to finalize the purchase of The Last Straw vineyard. He previously experienced a canceled wedding, giving him unexpected common ground with the people attempting to halt his business deal.

Michelle is an internationally famous actress who appeared on a magazine list of the fifty most beautiful people. She leverages her wealth and influence to disrupt her former boyfriend's current relationship. She desires to recreate a cohesive family unit for her young daughter by moving into the same London neighborhood as her ex.

Maddie is a four-and-a-half-year-old child who visits Sonoma County. She asks questions about the vineyard and shows a natural curiosity about symbiotic plants. She remains largely unaware of the adult conflicts surrounding her sudden arrival in California.

Margaret experiences deep emotional isolation in her marriage following a painful miscarriage. She openly discusses her unhappiness and desires to be truly seen by a romantic partner. Her vulnerability and alcohol consumption lead to a confusing boundary-crossing with her brother-in-law.

Henry is a symphony conductor working in San Francisco. He provides emotional support and artistic understanding to a former colleague whom he has known since her time as a young cellist in New York. He views her marital separation as an opportunity to establish a permanent romantic connection.

Suzannah works at a Los Angeles law firm and serves as a primary confidant. She provides practical advice over the phone regarding relationship conflicts, drawing on her own experiences with infidelity and forgiveness to guide her friend's choices.

Lee dates the chief executive officer of Murray Grant Wines. She dislikes Sonoma County and actively prefers living in a city environment, creating geographical friction in her relationship.

Ethan works as a deputy sheriff in Sebastopol. He repeatedly overlooks minor infractions committed by his childhood friend, demonstrating the close-knit, informal nature of the local law enforcement.