Lauren is the acknowledged queen bee of the wealthy Salcombe summer residents. Seeking a retreat from the stress of her New York City life, she projects an aura of icy elegance and reserve. Underneath her composed exterior, she harbors growing boredom with her superficial marriage to Jason and frequently allows others to impose on her boundaries.

Jason is a dark, intense man who insisted his family buy a summer home in Salcombe to remain close to his childhood circles. He spends his summers alongside his lifelong best friend, Sam. He carries a deep-seated jealousy toward Sam's effortless charm and success, which bleeds into his daily interactions and private resentments.

Rachel is a single, somewhat needy woman who lives for her Salcombe summers. As the island's inveterate gossip, she makes it her mission to uncover everyone's hidden secrets, often throwing the first party of the season to get people drunk and talking. She relies heavily on her connection to Lauren to maintain her status among the summer elites.

Robert is the new tennis pro for the Salcombe summer community. Coming from a middle-class background, he feels socially inadequate around the wealthy summer residents, leading him to simultaneously envy and resent them. He views his position at the tennis club as a stepping stone and quietly looks for ways to exploit the club's relaxed oversight.

Sam is a charming, wealthy, and easygoing golden boy who has spent every summer of his life in Salcombe. He is widely liked by the community and possesses an optimistic, trusting nature. However, his peaceful summer is threatened by a pending investigation at his workplace that causes him significant anxiety.

Jen is Sam's beautiful and seemingly perfect wife. Though widely liked by the community, she masks a selfish streak and a thrill-seeking nature beneath her polished exterior. She compartmentalizes her life carefully, ensuring her private indiscretions do not completely upend her comfortable marriage.

Micah is a perceptive young man who spends his summers tending bar for his parents' friends on Fire Island. From his vantage point behind the bar, he quietly observes the unvarnished behavior and hidden dynamics of the wealthy summer residents, keeping their secrets while questioning their morality.

Susan is an older, long-time resident who runs the Salcombe tennis club. She maintains a strict, traditional sense of right and wrong, sharply contrasting with the permissive attitudes of the younger summer crowd. She is watchful and highly attentive to the club's financial ledgers and social dynamics.

Larry is a practical, wealthy financier who spends his summers in Salcombe. He oversees the finances for the tennis club and possesses a pragmatic, somewhat cynical view of business and employee behavior, often valuing ambition over strict honesty.

Beth is a resident who feels perpetually victimized and alienated by Lauren's popular social circle. She frequently attempts to insert herself into the community through strategic lies and drama, though her efforts usually backfire and isolate her further.

Kevin is Beth's middle-aged husband. He spends most of his time detached from the real world, playing computer games and leaving his wife feeling like a single mother to their child.

Paul works in music promotion and considers himself culturally superior to his finance-obsessed neighbors. He masks his financial insecurities by allowing his wife to believe he earns significantly more than he actually brings home.

Emily is Paul's wife, a woman from a very wealthy family who comfortably subsidizes her and her husband's lifestyle. She enjoys participating in the island's gossip network alongside her close friend Lisa.

Lisa is a relatively grounded member of the Salcombe summer community. Though she sometimes rolls her eyes at her husband's crass remarks, she genuinely loves his inner warmth and finds herself defending him against the subtle judgments of their neighbors.

Brian is a good-natured but sometimes crass member of the summer community who highly admires Sam and Jason. He is currently hiding a significant financial burden resulting from a poor business investment.

Silvia is the Parkers' nanny. She finds the long Salcombe summers incredibly boring but appreciates the comfortable lifestyle provided by her wealthy employers. She is highly perceptive regarding the true, dysfunctional state of the Parkers' marriage.

Amelie is Lauren and Jason's young daughter. She heavily mirrors her mother's elegant and slightly imperious demeanor, maintaining her childhood innocence amidst the adult drama of Salcombe.

Lucy is Beth and Kevin's young daughter. Her minor childhood accidents often become the catalyst for her mother's oversized social dramas within the community.

Danny is an eight-year-old boy whose innocent perspective on the island sharply contrasts with the calculating nature of the adult residents. He explores the boardwalks and reedy areas on his bicycle, remaining largely oblivious to the community's darker undercurrents.