Hazel is a 28-year-old part-owner of a real estate renovation company in Charlotte. She returns to her hometown feeling alienated due to her mother's sudden disappearance fourteen years prior. She struggles with feelings of abandonment and the town's judgment, but she possesses a sharp eye for detail. This analytical mindset pushes her to seek answers when drought conditions reveal submerged cars in the local lake.

Nico is a high school teacher in Mirror Lake who acts as a diver for the local police department when requested. He lives directly next door to the Holt family property. As Hazel's high school ex-boyfriend, his proximity brings up complicated feelings for both of them. He carries the weight of his own father's tragic history and understands the pressures of living in a town dominated by police families.

Gage is Hazel's 30-year-old older stepbrother. Following his father's career path, he works as a detective on the Mirror Lake police force. During their youth, Gage frequently defended Hazel and served as a stabilizing force in the household. In the present, he focuses heavily on protecting his father's legacy and maintaining the status quo in their community.

Caden is Hazel's younger stepbrother, born just a few days after her. He serves as an officer on the Mirror Lake police force alongside Gage. He possesses a volatile temperament and openly resents Hazel, viewing her as an outsider. He is quick to anger and fiercely territorial regarding the Holt family property and legacy.

Roy is Perry's younger brother and the prominent local lawyer for Mirror Lake. He is viewed as a pillar of the community and acts as a surrogate father figure to Gage, Caden, and Hazel. He attempts to mediate the financial and property disputes between the siblings, encouraging Hazel to share her inheritance amicably.

Perry was a highly respected detective on the Mirror Lake police force. His sudden death from a heart attack brings his divided family back together. Remembered as a paragon of law and order, his surprising decision to leave his entire home to Hazel sets off a chain of conflicts among his children and prompts a deeper look into his private life.

Jamie is Caden's wife and the mother of their young daughter, Skyler. During high school, she was Hazel's best friend. Their relationship deteriorated when Hazel tried to warn Jamie away from Caden's volatile personality. She appears nervous and on edge around the Holt family home, eventually vanishing without explanation after an argument with her husband.

Skyler is the six-year-old daughter of Caden and Jamie. Sweet-tempered and observant, she enjoys spending time near the water. Her innocent discoveries around the lake and the family home inadvertently push Hazel's investigation into the family's past forward.

Libby is Hazel's missing mother. She arrived in Mirror Lake as a known con artist, keeping one step ahead of her past, before marrying Perry Holt and settling down. She vanished when Hazel was fourteen, leaving behind an empty car, accusations of a $10,000 theft from Roy's law firm, and a cryptic goodbye note addressed to "Daughter of Mine."

Serena is a young police officer in Mirror Lake who went to high school with Hazel. Following in her detective father's footsteps, she takes charge of investigating the mysterious cars pulled from the drought-stricken lake. She balances her official duties with a strong sense of loyalty to the tight-knit local police community.

Nicholas was Nico's father and Perry Holt's former partner on the police force. He died when Hazel was fifteen in an event officially ruled an accident but widely rumored to be suicide. He kept a secret room filled with old crime scene photos that continues to impact his son years later.

Audrey was Perry Holt's first wife and the mother of Gage and Caden. She died in a fatal bicycle accident at night years before Libby and Hazel arrived in Mirror Lake. Her sudden death left her young sons with lasting psychological trauma.

Sonny is Jamie's mother. She works as a maid at the Mirror Lake Motel and struggles with substance abuse. Having lived in the town her whole life, she possesses a cynical view of the Holt men and openly shares her sharp observations about their failed marriages with Hazel.

Al is a seasoned detective on the Mirror Lake police force and Serena's father. He embodies the town's tight-knit law enforcement culture, preferring to handle investigations without outside interference, and frequently advises Hazel to return to Charlotte.

Pete is a retired detective who knows the local gossip better than anyone. Unlike many others in town, he seems genuinely pleased to see Hazel. He holds deep knowledge about the older generation of Mirror Lake's police force and the events surrounding Perry's past.

Joe is a man from Libby Sharp's past who knew her as Beth. Hazel and her mother lived with him briefly before fleeing and eventually settling in Mirror Lake.

Keira is one of Hazel's college friends and business partners at their real estate renovation company. She is eager to hear about the inherited property's rehab potential and frequently checks in on Hazel.

Luke is Hazel's other college friend and business partner in her successful real estate renovation company in the city of Charlotte.

Levi is a local high school student who works at the Country Store. He is also one of Nico's students and part of the younger generation residing in the small town during the recent string of neighborhood disturbances.

Miles is the co-host of a true crime YouTube channel called Water Hunters. He arrives in Mirror Lake hoping to film and capitalize on the discovery of the submerged vehicles, frequently clashing with locals over property boundaries.

Amber runs the true crime YouTube channel Water Hunters with her sibling. She holds a cynical view of local police forces and actively seeks out submerged mysteries to solve for her online audience.

Max is a local teenager in Mirror Lake whose recent disappearance distracts the police force from the submerged vehicles and requires significant town resources to investigate.

Carly is an art teacher at the local high school who assists Nico by developing photographs found on a discarded instant camera from a local overlook.

Melvin is a police officer in Mirror Lake who reviews photographic evidence regarding the recent disturbances and empty house burglaries around town.