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.

艾米丽和兰德尔是一对年轻情侣，他们假期逃到自家的海滩别墅重新寻找感觉。期间兰德尔父亲的一对旧友夫妇造访，他们四人也相处融洽非常投缘。但海滩别墅周围的环境却变得越来越奇怪，海滩的景色和水中的生物也渐渐变得怪异，他们像是被感染一般恍惚不适，而艾米丽则要尽力在一切太晚之前弄清楚这到底是怎么回事。。。