Wylie is a true-crime writer renting an isolated, century-old farmhouse in rural Iowa to complete her latest manuscript. She is a solitary figure who actively avoids interacting with locals and dodges phone calls from her ex-husband. Trapped by a severe winter storm without communication, she discovers an injured child and a crashed truck, forcing her to rely on her survival instincts to protect her uninvited guests.

Josie is a twelve-year-old girl living on an agricultural farm in Blake County, Iowa, in the year 2000. She is observant and deeply connected to her family's land, though she often feels overshadowed by her older brother's rebellion and her best friend's burgeoning interest in boys. Her peaceful summer shatters when an unknown assailant attacks her family, forcing her to flee into a dark cornfield.

Becky is Josie Doyle's thirteen-year-old best friend who visits the Doyle farm during the summer of 2000. Described as beautiful with long curly black hair, she is transitioning into adolescence and showing a clear interest in boys. During a violent attack on the Doyle farm, Becky disappears into the night, becoming the subject of a massive police search.

Ethan is Josie Doyle's sixteen-year-old brother, experiencing a phase of intense teenage rebellion in the summer of 2000. He is moody, frequently defies his parents' orders, and proudly possesses a camouflage shotgun gifted by his grandfather. His erratic behavior and association with controversial friends make him an early focus of the police investigation.

William is the patriarch of the Doyle family, managing an idyllic agricultural property in rural Iowa. He is a strict but protective father who grows increasingly frustrated with his son Ethan's disobedience and reckless handling of firearms. He also harbors a long-standing grudge against a neighboring family over a land dispute.

Lynne is Josie and Ethan's mother, working constantly to maintain harmony within her household during rising family tensions. She tries to manage Ethan's rebellious streak and keep the family's internal conflicts from embarrassing them in front of neighbors.

Randy is a local farmer in Blake County who is known for his intense focus on purchasing and refurbishing property. He previously engaged in a legal dispute with William Doyle over a piece of farmland, leading to a long-standing feud between their families.

Brock is Ethan's rebellious friend and Randy Cutter's teenage son. He frequently engages in delinquent behavior, including driving on a suspended license and inappropriately touching Becky Allen. He is viewed with suspicion by local law enforcement due to his complete lack of respect for authority.

Jackson is an adult military veteran living with his ailing mother on a neighboring farm. Since returning from the Gulf War, he has struggled with alcohol abuse and has a history of run-ins with the law. His nervous demeanor and criminal record quickly draw the attention of investigators following the local tragedy.

June is Jackson's mother, a woman in her sixties suffering from terminal cancer. She is generally kind and sociable but becomes fiercely defensive of her son when law enforcement begins questioning him about local crimes.

Margo is Becky's mother, who works at the local grocery store. When she learns of the incident at the Doyle farm, she becomes frantic and desperate for answers, clashing with law enforcement as she searches for her missing daughter.

Kevin is Becky's father, who is separated from his wife Margo. He remains at the family home during the crisis, struggling with fear and trying to manage the devastating updates from law enforcement.

Matthew is Josie and Ethan's grandfather. He is the first person to find Josie after the attack and immediately takes charge, shielding her from further trauma and acting as a physical barrier between her and the aggressive inquiries of others.

Caroline is Josie and Ethan's grandmother. She provides gentle comfort to Josie and must break difficult news to her, taking on the heavy responsibility of becoming Josie's new guardian.

John Butler is the local Sheriff of Blake County. Accustomed to a peaceful, low-crime agricultural community, he is suddenly thrust into managing a massive, chaotic crime scene and coordinating with state investigators.

Levi is a Sheriff's Deputy in Burden. He occasionally lets personal nostalgia cloud his professional judgment, such as giving Brock Cutter a break during a traffic stop, but he becomes relentless in his pursuit of leads once the investigation officially begins.

Camila Santos is a state investigative agent. Despite her small stature, she projects an immediate aura of authority and quickly organizes the chaotic local crime scene. She shows particular empathy when dealing with female victims and grieving mothers.

Agent Randolph is Camila Santos's partner from Des Moines. He assists in surveying the crime scene and develops early theories regarding the suspect's motives and weapons.

Deb is Randy Cutter's wife and Brock's mother. She battles severe anxiety over her son's misbehavior and her husband's intense obsession with acquiring farmland.

Seth is Wylie Lark's fourteen-year-old son. He is currently experiencing teenage impulsiveness and a desire for independence, which has created a temporary estrangement between him and his mother.

Tas is a coonhound stray dog that Wylie has inadvertently adopted. He stays with Wylie at the isolated farmhouse and is the reason she ventures into the winter storm, leading her directly to the injured child.