Scottie Ferguson is a San Francisco detective forced into retirement by an insurmountable vertigo born of an accident. An old acquaintance hires him to watch his wife, a beautiful, mysterious woman who seems possessed by the ghost of an ancestor, and Scottie plunges into her trail until he falls into a sickly obsession. When tragedy strikes, his fixation drags him through a spiral of desire, identity and deception. A masterpiece of psychological suspense, hypnotic and vertiginous, one of the absolute peaks of its director's career.