Nicolette (Nic) is a counselor living in Philadelphia with her fiancé. Ten years ago, she fled her small hometown of Cooley Ridge, North Carolina, following the disappearance of her best friend, Corinne. Now back in town to help sell her childhood home and manage her father's declining health, Nic finds herself drawn into another missing persons case when a local girl vanishes.

Corinne is Nic's former best friend who vanished following a local fair ten years ago. Beautiful, charismatic, and fiercely manipulative, she commanded the attention of everyone in Cooley Ridge and frequently pushed her friends to their emotional and physical limits. Her disappearance remains an unsolved legend that dictates the fears and actions of those she left behind.

Annaleise is a young woman, slightly younger than Nic's friend group, who goes missing almost immediately after Nic arrives back in Cooley Ridge. Known for being quiet and artistic, she has always harbored a voyeuristic interest in Nic, Corinne, and their friends. Her sudden disappearance forces the town to reexamine the tragic events of ten years ago.

Daniel is Nic's older brother who stayed behind in Cooley Ridge when she left for Philadelphia. He is married and expecting his first child, trying to build a stable family life despite the lingering shadows of his past. He struggles to manage their ailing father and harbors a tense, complicated dynamic with Nic, marked by an unspoken history of anger.

Tyler is Nic's high school sweetheart who still resides in Cooley Ridge and works in construction. He possesses a deep understanding of Nic that borders on instinctual, having shared her formative years and the trauma of Corinne's disappearance. Despite Nic's engagement to Everett, Tyler's presence remains a powerful force in her life.

Everett is Nic's fiancé, a successful and pragmatic lawyer residing in Philadelphia. He represents Nic's escape from Cooley Ridge, offering a safe, stable, and completely separate life. When he visits the town to help her manage her father's estate, his aggressive legal mindset and outsider status put him at odds with the insular, secretive nature of the locals.

Jackson is the local bartender at Kelly's Pub and Corinne's boyfriend at the time she vanished. With his broad shoulders and handsome features, he was heavily scrutinized by the town and police after Corinne went missing, enduring a decade of suspicion. He maintains a quiet solidarity with Nic and the others who survived the fallout of that summer.

Bailey is the third member of Nic and Corinne's high school trio, who has since become a divorced mother. Following Corinne's disappearance, she gave crucial statements to the police that fractured her relationships with her friends, particularly Nic. She remains in town but keeps her distance, carrying immense bitterness toward Corinne.

Patrick is Nic and Daniel's father, a former community college philosophy professor whose mental stability began deteriorating after the death of his wife. He now resides at Grand Pines, a care facility, where his memory frequently slips between past and present. His cryptic, seemingly confused statements often hold uncomfortable truths about the town's buried history.

Hannah Pardot is an agent with the State Bureau of Investigation, known for her piercing eyes and thorough, no-nonsense approach to police work. Unlike the local police who were swayed by town gossip, she objectively interviewed the friend group during Corinne's initial disappearance and returns to Cooley Ridge when history appears to repeat itself.

Laura is Daniel's wife, a Cooley Ridge local who is currently pregnant with their first child. She was not part of Nic's inner circle during high school, giving her a slight remove from the intense history shared by the others. She is deeply focused on preparing for motherhood and maintaining a stable family environment despite the surrounding chaos.

Mark is Bailey's younger brother who has grown up to become a police officer in Cooley Ridge. He finds himself directly involved in the investigation into Annaleise Carter's disappearance, especially after it is discovered that Annaleise texted him right before she vanished.

Karen Addelson is the director of Grand Pines, the care facility where Patrick Farrell resides. She balances the medical well-being of her residents with legal obligations, finding herself caught between the Farrell family's demands for privacy and the local police's ongoing investigation.

Detective Charles is an investigator brought in to help search for Annaleise Carter. With an accent that marks him as an outsider to Cooley Ridge, he lacks an understanding of the town's deep-rooted social dynamics, leading to friction when he tries to interrogate the locals.

Officer Fraize is a local policeman in Cooley Ridge involved in the search efforts for the missing girls. As a local, he knows the residents well and carries the historical weight of Corinne's unsolved case into the current investigation.

Bryce is Annaleise Carter's brother. Despite his sister going missing, he displays a chilling detachment from the situation, preferring to hang out with friends in the woods and expressing little outward urgency about her disappearance.