In a quiet town in California, a man's life is interrupted when he receives a mysterious visit from his sister, who arrives with the promise of helping him resolve problems that have tormented his life. However, the arrival of this enigmatic woman unleashes a series of unsettling and dark events that reveal buried secrets and a family marked by tragedy.
The plot revolves around a man's struggle to maintain control over his life as he faces his sister's growing madness. As the story unfolds, the tension escalates when inexplicable homicides begin to occur in the town. The atmosphere becomes increasingly oppressive, and the viewer will constantly question the loyalty and sanity of each character.
With unexpected twists, the narrative unfolds a complex blend of suspense and surprising revelations. The film explores themes of identity, madness, and the impact of the past on the present. Through William Castle's direction, a visual style is showcased that amplifies emotions and latent terror, ensuring that each scene keeps the audience on the edge of their seat.
With a chilling ending that defies expectations, the story culminates in a revelation that leaves a lasting impression, prompting the viewer to rethink what they believed they knew about family relationships and madness.