Plot: It's the late nineteenth century. Paula Alquist (Ingrid Bergman), an aspiring opera singer, and Gregory Anton (Charles Boyer), the accompanist at her singing lessons under the tutelage of Maestro Guardi (Emil Rameau) in Italy, fall in love and get married. Before learning of her background, Gregory is able to convince her to live in London, then when she divulges to him that she owns a house there at 9 Thornton Square, it bequeathed to her by her famous maternal aunt, opera singer Alice Alquist, who raised Paula and whom Paula found murdered in the house, the murder never solved. Not having thought about the house in a long time, Paula believes Anton's love can help her through whatever pain she may have felt about her aunt's murder now to live there with him. Over time at the house, Paula begins to forget things, lose things, and imagine things - such as an animosity with the new Cockney housekeeper Nancy (Angela Lansbury), who has a penchant for making "friends" with whatever Police Constable is patrolling the neighborhood - with Gregory quietly convincing her, without using the exact words, that she is ill. As such, she becomes isolated in the house, which only exacerbates her feeling that she indeed is going mad. However, two people on the outside believe that funny things are happening behind the closed doors of 9 Thornton Square, where only the domestics, Elizabeth (Barbara Everest) and Nancy, are allowed in, and only Gregory, who ever leaves by himself to take a walk every night. Those two are: Miss Thwaites (May Whitty), an elderly busybody neighbor who loves a good mystery; and Brian Cameron (Joseph Cotten), a fan of Alice Alquist, and who, in his professional life, arguably knows the most about her murder besides the actual murderer.
Alternative Plot: After the death of her famous opera-singing aunt, Paula (Ingrid Bergman) is sent to study in Italy to become a great opera singer as well. While there, she falls in love with the charming Gregory Anton (Charles Boyer). The two return to London, and Paula begins to notice strange goings-on: missing pictures, strange footsteps in the night and gaslights that dim without being touched. As she fights to retain her sanity, her new husband's intentions come into question.
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