In Victorian London, a young and charming woman named Paula moves into an old mansion after marrying an intriguing pianist, Gregory. At first, Paula feels fortunate, but as the days go by, her happiness begins to fade. Gregory exhibits strange behavior that becomes increasingly controlling and manipulative. He starts planting doubts in Paula's mind, causing her to question not only her sanity but also her memories and perceptions of reality.
As the atmosphere in the house grows more oppressive, Paula feels trapped in a psychological labyrinth. Lights mysteriously go out, objects disappear, and the small things that happen to her are dismissed by Gregory, who insists that she is imagining things. Paula tries to cling to her sanity, but with each passing day, her confidence dwindles, and confusion deepens.
Over time, a police inspector takes an interest in the situation and begins to investigate the dark past of the mansion. Paula, torn between desperation and the pursuit of truth, becomes a determined figure intent on uncovering her husband's true intentions and the nature of their relationship. With unexpected twists, the tension escalates, leading to a revealing climax that confronts the manipulations and the power of love that can turn into a prison. In this oppressive environment, the search for truth becomes Paula's only escape.