When Anita Naakka jumps in front of an oncoming train, her daughter, Norma, is left alone with the secret they have spent their lives hiding: Norma has supernatural hair, sensitive to the slightest changes in her mood — and the moods of those around her — moving of its own accord, corkscrewing when danger is near. And so it is her hair that alerts her, while she talks with a strange man at her mother’s funeral, that her mother may not have taken her own life. Setting out to reconstruct Anita’s final months — sifting through puzzling cell phone records, bank statements, video files — Norma begins to realize that her mother knew more about her hair’s power than she let on: a sinister truth beyond Norma’s imagining.