Selena is a working mother who recently returned to full-time employment after her husband lost his job. On the surface, she maintains the appearance of a perfect life, often sharing idealized pictures of her family online. Internally, she suppresses difficult emotions to keep the peace at home, a habit she is forced to abandon when she catches her husband sleeping with their nanny.

Graham is Selena's charming but immature husband who recently lost his job, forcing his wife to shoulder the family's financial burdens. He has a history of questionable behavior, infidelity, and aggression that Selena has largely excused for years. He relies heavily on his charisma to avoid consequences and deflect blame when confronted with his wrongdoings.

Pearl is a quiet, observant teenage girl who lives with her unpredictable single mother. Used to fading into the background, she is highly perceptive and pays close attention to the details of people's lives. She forms a quick and meaningful connection with her mother's newest boyfriend, appreciating that he respects her mind and shares her love of literature.

Charlie is a quiet, intelligent man who is hired to work at Stella's bookstore before moving into her home. Unlike the loud, careless men Stella usually dates, Charlie is attentive and thoughtful. He cooks dinner, discusses classic literature, and provides a rare stabilizing presence for both Stella and her daughter.

Geneva is the 25-year-old nanny employed by the Murphy family to care for Oliver and Stephen. She is highly organized and efficient, often compensating for Graham's lack of parenting skills. Despite her competence with the children, she harbors guilt over her secret relationship with Graham and senses that her days with the family are numbered.

Oliver is the older of Selena and Graham's two sons. Unlike his carefree younger brother, Oliver is sensitive, serious, and highly perceptive of the tension in his home. He notices details that the adults assume he misses and struggles to make sense of the unspoken conflicts between his parents.

Stephen is Selena and Graham's younger son. He is generally oblivious to the growing tension in the household and the strain in his parents' marriage. He snores loudly and sleeps soundly, completely unaware of the domestic drama unfolding around him.

Will is a stable, reliable lawyer and Selena's ex-boyfriend. He offers a sharp contrast to Graham's chaotic nature, representing the safe, secure life Selena chose to walk away from. When Selena's life begins to unravel, he steps in to provide legal guidance and emotional support.

Stella is Pearl's single mother and the owner of a financially struggling bookstore. She is reckless, unpredictable, and often more focused on her romantic life than on providing stability for her daughter. Despite her chaotic lifestyle, she manages to make ends meet through mysterious means.

Cora is Selena's mother, who lives nearby with her second husband. Having endured years of infidelity from Selena's father before finally divorcing him, she is highly sensitive to the signs of a failing marriage. She offers her daughter practical advice and a safe haven, hoping Selena will avoid repeating her own mistakes.

Paulo is Cora's second husband and Selena's stepfather. He provides a stable, loving environment for Cora, standing in sharp contrast to the unfaithful behavior of Cora's first husband. He serves as a positive male role model for Selena's sons.

Beth is Selena's best friend and her boss at the literary agency. As a divorced woman who survived her own husband's infidelity, she has a strict policy of loyalty and understands the complexities of marriage. She is perceptive enough to know Selena is hiding something but respects her boundaries.

Hunter Ross is a retired policeman who refuses to fully step away from his investigative work. Disillusioned with the cracks in the criminal justice system, he dedicates his free time to poring over cold cases, unable to forget the people who have vanished off the grid.

Detective Crowe is the police investigator assigned to Geneva's missing persons case. He uses a gentle but firm interrogation style, referencing his own personal experiences to build rapport with witnesses. He is methodical in exposing the lies the Murphy family tells him.

Hugh is a married executive who engages in an illicit workplace affair. He makes grand promises about leaving his wife for his mistress, though his actual intentions are far less courageous. His behavior puts both his marriage and his professional standing at risk.

Kate is Hugh's intelligent and powerful wife who owns the investment firm where he works. Rather than breaking down when she discovers her husband's infidelity, she handles the situation with ruthless corporate efficiency, utilizing her wealth and authority to protect her interests.

Erik Tucker is a neighbor of the Murphy family and Geneva's previous employer. His illicit history with the nanny results in him being drawn into the police investigation when she goes missing from the Murphys' home.