Meredith is a pragmatic and logical woman who married Scott after losing her first husband, James, to cancer. She built a new life with Scott and stepped into a maternal role for Abbi, bringing stability to a family shadowed by tragedy. When Scott's missing first wife is found alive, Meredith faces the complex emotional challenge of determining her place in a suddenly crowded household. She struggles to maintain her marital bond while observing inconsistencies in the returning woman's behavior.

Abbi is a 16-year-old high school student who was only five when her mother disappeared. Having grown up relying heavily on her father's idealized stories, she craves a genuine maternal connection and is eager to bridge the gap with the woman who has returned. She often feels excluded from adult conversations regarding the investigation, which fuels a rebellious desire for independence and a fierce loyalty to her newly returned mother.

Kate is Scott's first wife and Abbi's biological mother. Before her disappearance, she was a vibrant journalist eager to explore new experiences, feeling subtly trapped by her husband's resistance to change. After spending over a decade within a secluded community, she returns deeply changed, bearing the physical and psychological marks of immense trauma. She struggles to reconcile her indoctrinated mindset with the family she left behind.

Scott is a dedicated father and husband who lived under the cloud of suspicion following his first wife's disappearance. He spent years holding onto an idealized memory of his marriage, unable to acknowledge the marital conflicts that existed before the tragedy. His steadfast loyalty to his missing wife complicates his current marriage and clouds his judgment when he attempts to reintegrate her into his modern life.

Ray is the charismatic and domineering leader of Love International, an organization that purports to help college students overcome addiction. He demands extreme dedication from his followers and uses an alluring mix of spirituality and authority to draw members into isolated communities. He utilizes a calculated system of praise, punishment, and deception to ensure total compliance from his disciples.

Shiloh is an infant born under harsh conditions during Kate's time away from civilization. She is the fragile focus of Kate's protective instincts, representing the physical reality of the missing years.

Dean is the lead FBI investigator assigned to the case, having originally investigated the initial disappearance years prior. He acts as a comforting, familiar presence to the family while methodically trying to uncover what exactly happened during the missing decade.

Camille is a specialist brought in to conduct daily interviews. She is patient and analytical, using recordings and careful observation to piece together the fractured mental state and past experiences of trauma survivors.

Brian is an expert in cult psychology who assists the federal investigation. He attempts to explain the complex psychological state of mind-control survivors to the civilian family, providing blunt but necessary assessments.

Marcos is the local lead investigator in Montana who initially handles the reappearance case. He briefs the relatives on the dire physical conditions involved and manages the early stages of the transition before federal authorities take over.

Margo is an established member of the secluded group who guides new recruits through their early involvement. She navigates the community's strict, evolving rules and forms a tight bond with others as the leadership's demands escalate.

Will is a member of the secluded community whose loyalty to the leadership often supersedes his devotion to his marriage. He complies with the escalating demands placed upon the group's members.

Bekah is an established member of the organization who strictly adheres to its modesty and behavioral guidelines. She embodies the beige-clad conformity of the group and experiences the harsh realities of their isolated lifestyle.

Sam is a community member who forms a romantic connection and starts a family within the strict confines of the group. He struggles against the leadership's dangerous protocols when his family's well-being is threatened.

Miles is a young boy raised in the highly controlled environment of the cult. His upbringing and daily routines are heavily influenced by the constant oversight of the leadership.

Christina is a college friend who remains connected to the family's life prior to the crisis. She voices practical, grounded concerns about her friend's growing fascination with alternative retreats and organizations.

Caleb is a young adult son from a previous marriage. He provides long-distance emotional support to his mother during the chaotic upheaval of her new family dynamics.

Thad is a college-aged son from a previous marriage. Living away from home, he maintains a protective stance regarding his mother and offers an outside perspective on the strange dynamics developing in her household.

Meaghan is a high school student who provides a typical teenage sounding board for her best friend. She attempts to offer distraction through normal high school gossip while remaining curious about the high-profile events surrounding the family.

Willow is a young woman who joins the secluded group and struggles deeply with the severe physical and psychological expectations of the required purification ceremonies.

James is a deceased first husband whose memory serves as a quiet point of comparison. Though he passed away from cancer, the unvoiced dissatisfaction in that marriage heavily influences how his widow approaches her current relationships.

Leo is an editor at the local newsgroup, Forum. He provides the initial professional catalyst for a major life change by passing along a specific, personalized interview request to his reporter.

Zed is an infant born into a highly controlled environment. His safety becomes a driving concern for the adults around him as the community's circumstances grow increasingly erratic.