The Unheard follows 20-year-old Chloe Grayden (Lachlan Watson), who after undergoing an experimental procedure to restore her damaged hearing, begins to suffer from auditory hallucinations seemingly related to the mysterious disappearance of her mother.
Police officer Jane Rydert's life goes into a tailspin the day her older sister, Cassidy, shows up at her door after sixteen years of confinement in a psychiatric hospital.