On the verge of being homeless with her chronically ill mother, a young woman reluctantly agrees to care for a mad woman locked away in an upstairs room of a gloomy castle. When she falls in love with the woman's son, she must decide whether to continue deceiving him or begin their married life free of secrets and lies. Once she becomes entangled in this strange family, she realizes that she's not the only one hiding things. And the mad woman upstairs might be the least of the horrors that lie in her wait.