In a small New England village at the turn of the century, a series of murders targeting women with disabilities haunts the community. Helen, a mute young woman living in the sprawling and gothic Warren mansion, finds herself increasingly threatened as she becomes aware that the killer is likely someone within the house. The mansion is presided over by the bedridden Mrs. Warren, whose mysterious and controlling nature adds to the tension. Dr. Parry, a local physician who visits regularly, becomes Helen's confidant and protector, while other residents, such as Professor Albert Warren and his stepbrother Steven, exhibit suspicious behavior. The stormy night sets the scene for mounting dread as the killer's presence becomes ever more palpable.

Helen's vulnerability and isolation are heightened by the mansion's labyrinthine corridors and secret passages. With every creak of the extensive woodwork and flicker of candlelight, the sense of impending danger grows. Clues to the murderer's identity slowly unravel amidst layers of fear and confusion. As the evening progresses, Helen must rely on her wits and limited communication abilities to navigate the perilous situation. Each step she takes through the darkened mansion brings her closer to either escape or confrontation with the lurking menace within its walls.