Mia is a former public relations specialist from London who relocates to a small village in Bedfordshire to renovate a house. Pregnant with her first child, she is acutely aware of her own emotionally distant upbringing and desperately wants to provide a stable environment for her family. When she discovers an ominous message carved into the floorboards, her intense curiosity and protective instincts drive her to investigate the property's disturbing history.

Finn is Mia's husband, a man who has brought his wife back to his childhood village to establish their family roots. Outwardly agreeable, he focuses his energy on home renovations and maintaining peace between his wife and his highly involved parents. He frequently suppresses his own concerns to present a confident front, prioritizing a picture-perfect family image over addressing uncomfortable truths.

Debbie is Finn's mother, a Stewkbury local who takes an intense, hands-on interest in her son's marriage and future. She eagerly anticipates becoming a grandmother but frequently oversteps boundaries, criticizing Mia's tattoos and parenting instincts. Beneath her helpful, maternal exterior lies a deeply controlling personality shaped by a severely traumatic childhood.

Dave is Finn's father and a lifelong construction worker. He generally acts as the placater in the Hunter family, attempting to smooth over the frequent arguments between Debbie and Mia. Privately, he battles severe stomach pain and self-medicates with illegal painkillers, hiding his vulnerabilities from his family to maintain his role as a reliable provider.

Sonny is the infant child of Finn and Mia. Born during the chaos of a traumatic accident at the Stewkbury house, his presence heightens the emotional stakes for everyone in the family. He serves as the focal point for Mia's maternal anxieties and Debbie's overbearing demands for access.

George is Debbie's older brother who shared her deeply traumatic, isolated upbringing. After a violent altercation with their parents, he vanished from her life entirely. His absence leaves a permanent scar on Debbie's psyche and influences her fierce desire to control her current family unit.

Mark is a former detective who becomes entwined in the mystery of the children's bodies found in the attic. He provides Mia with professional insights and a sympathetic ear, validating her concerns when her own family dismisses them.

Lorna is an old college friend of Mia's who has a personal connection to the dark history of the Stewkbury house. Her little brother, Frankie, was one of the missing children. Reconnecting with Lorna gives Mia a crucial emotional lifeline outside the suffocating environment of the Hunter family.

Frankie is Lorna's little brother, a victim whose story deeply impacts Mia's perspective on motherhood and loss. His family's enduring love for him teaches Mia about the risks and rewards of opening her heart to her own child.

Jasmine is a local Stewkbury mother who has spent decades caring for her disabled daughter, Precious. She firmly believes that her daughter's tragic childhood accident is connected to the other disappearances in the village, refusing to accept the official police narrative.

Precious is Jasmine's daughter, a woman who suffered severe head injuries in a hit-and-run accident as a child. The trauma left her permanently disabled and unable to clearly communicate her terrifying past, though she retains visceral, panicked reactions to anything connected to the people who hurt her.

Abigail is one of the young victims whose body is discovered in the attic of the Stewkbury house. She was a childhood classmate of Precious Johnson, and her tragic fate serves as the primary catalyst for Mia's relentless search for the truth.

Emma is Finn's ex-girlfriend. Even though Finn has been married to Mia for five years, Emma remains a source of friction, largely because Debbie continually praises her and displays her photos. She has a daughter, Chloe, and maintains a complicated connection to the Hunter family.

Chloe is Emma's young daughter. Her existence and background become a point of intense public and private scrutiny as the secrets of the Hunter family slowly unravel under the media spotlight.