Christine Prusik is a 35-year-old forensic anthropologist leading the FBI's Midwest Forensic Sciences Laboratory. She relies on her sharp intelligence and intuition to solve complex cases, though she frequently faces sexism from her male colleagues. Prusik secretly struggles with severe anxiety and panic attacks stemming from a near-fatal attack she survived as a graduate student in Papua New Guinea.

David Claremont is a 22-year-old man living with his adoptive parents in Weaversville, Indiana. He works on his family's farm but suffers from debilitating panic attacks, intense daydreams, and sudden blackouts. Fearing that a dark force is attempting to control him, he seeks psychiatric help while trying to maintain a normal life in his small town.

Donald Holmquist is a young man who grew up in a condemned tenement building in Chicago. Raised by a harsh and abusive mother, he endured severe punishments as a child, including being forced to swallow gravel. As an adult, he is deeply influenced by these early traumatic experiences and harbors an obsession with artifacts from the Chicago Museum of Natural History.

Joe McFaron is the 35-year-old County Sheriff of Weaversville, known for his tall stature and deep ties to the local community. He is widely respected by the townspeople but struggles with emotional numbness following the death of his father. When a murder investigation brings the FBI to his jurisdiction, he proves to be a considerate and dedicated law enforcement officer.

Roger Thorne is the Managing Director of the FBI's Midwest division and Prusik's direct supervisor. A politically minded bureaucrat, he prioritizes optics and public relations over loyalty to his team. He often marginalizes Prusik in favor of male agents, a dynamic complicated by a brief romantic history between them.

Bruce Howard is a field agent for the FBI who views himself as a traditional 'man's man.' He is highly ambitious and frequently bypasses the chain of command to speak directly with upper management. Arrogant and dismissive, he actively works to sideline female colleagues and local law enforcement officers during investigations.

Missy Hooper is a young woman whose family recently moved to the town of Blackie, Indiana. Disappointed when her plans fall through, she is easily flattered by the attention of a handsome young man who offers to win her a carnival prize.

Julie Heath is a fourteen-year-old girl living in the small, close-knit town of Crosshaven, Indiana. She is helpful and kind, which leads her to agree to assist a stranger who claims to be rescuing a turtle near a wooded ravine.

Joey Templeton is a young boy who recently lost his parents in a train accident. While spending time near Old Shed Road, he spots a suspicious man placing something into a rusted truck, making him a crucial witness in a local disappearance.

Dr. Irwin Walstein is a psychiatrist practicing in the Weaversville area. He treats patients for anxiety and depression, attempting to help them distinguish between normal daydreams and concerning hallucinations.

Brian Eisen is the lead technician at the FBI's Midwest Forensic Sciences Laboratory. He works closely with the rest of the forensic team to analyze DNA, fingerprints, and crime scene environments, providing vital updates to the lead investigators.

Dr. Emil Katz is a behavioral scientist working for the FBI. He specializes in psychological profiles and rare psychological phenomena, helping field agents understand the mental states of both suspects and victims.

Doc Henegar is the county coroner for the Crosshaven area, operating his office out of his own home. He is a pragmatic medical professional who works quietly to process forensic evidence without alerting the local media.

Maddy Heath is a young girl living in Crosshaven, Indiana, and the younger sister of Julie Heath. As a member of the local Girl Scout troop, she spends time in the nearby woods, where she occasionally encounters strangers.

Bruna Holmquist was a Norwegian immigrant who lived in a tenement building in Chicago. As a mother, she was exceptionally harsh, subjecting her child to severe physical and psychological punishments for minor infractions like wetting the bed.

Bob Heath is a resident of Crosshaven, Indiana, and the father of two daughters. He relies heavily on the local police force to find answers when tragedy strikes his family.

Karen Heath is a resident of Crosshaven, Indiana, known locally for being somewhat anxious. When her teenage daughter fails to return home, she immediately alerts the police, setting off a town-wide search.

Glenna is a young woman who makes plans to attend a local amusement park. When she cancels at the last minute, her absence inadvertently leaves her friend vulnerable.

Stuart Brewster is a field agent working in Blackie, Indiana. He assists the FBI team by securing outdoor environments and managing logistical concerns before weather ruins potential evidence.

Leeds Hughes is the DNA expert for the FBI's Midwest Forensic Sciences Laboratory. He works in a specialized capacity to process biological materials found at various crime scenes.

Leroy Burgess serves as the entomologist for the FBI's Midwest Forensic Sciences Laboratory. He studies insect activity on decaying remains to help determine timelines for the investigative team.

Pernell Wyckoff is a fiber expert employed by the FBI's Midwest Forensic Sciences Laboratory. He examines clothing and environmental materials left behind by suspects.

Paul Higgins is a computer sleuth working for the FBI's Midwest Forensic Sciences Laboratory. He handles digital tracking, background checks, and electronic evidence for the regional office.