Charlotte Hollis Bette Davis and her married lover John Mayhew Bruce Dern plan to elope during a party at the Hollis family's antebellum mansion in Ascension Parish, Louisiana. The moment is charged with tension as Charlotte’s family and guests mingle, but the mood darkens when Charlotte’s father Sam Hollis Victor Buono confronts them about the affair. Sam’s stern warning is sharpened by the news that John's wife Jewel Mayhew Mary Astor had visited the day before and revealed everything. John tries to put on a brave face, telling Charlotte that their love has ruined itself and that they must part ways. Yet, before the night ends, tragedy strikes: John is ambushed and decapitated in the summerhouse by an unknown assailant wielding a cleaver. The image of a bloodstained Charlotte returning to the mansion, witnessed by the shocked guests, lingers as a chilling reckoning for everyone involved.
Thirty-seven years drift by, and the once-scandalous affair becomes a whispered legend that haunts the estate. Charlotte, now a settled spinster who has inherited the property after her father’s death, lives under the watchful care of Velma Cruther Agnes Moorehead, her devoted housekeeper. The elder murder case casts a long shadow: the locals keep insisting that Charlotte was involved, even as she holds fast to the memory of a life forever altered by that night. External pressures mount when the Louisiana Highway Commission informs her that she will be evicted to make way for a new interstate project. Undeterred, Charlotte stands firm, even threatening the demolition crew with a rifle as she reserves her stubborn hold on the family home.
Seeking allies in her struggle against the encroaching modernization, Charlotte summons Miriam Deering Olivia de Havilland, her successful businesswoman cousin who once lived with the family and has since built a life in New York. Miriam’s return rekindles an old dynamic: she soon resumes a romantic connection with Drew Bayliss Joseph Cotten, a local doctor who once let her down. As Miriam’s influence grows, Charlotte’s grip on reality begins to fray. The nights fill with an eerie harpsichord melody—the tune John wrote for her—that seems to echo through the shadows, accompanied by disturbing visions of John’s disembodied hand and head lingering at the edge of consciousness.
Velma grows increasingly wary, suspecting that Miriam and Drew are scheming to seize Charlotte’s fortune. She turns to Mr. Willis, an English insurance investigator who remains fascinated by the old case and who has visited Mayhew’s ailing widow, Jewel Mayhew Mary Astor, carrying an envelope to be opened only after Jewel’s death. The web of suspicion tightens as Miriam seizes power over the household, and Velma’s efforts to bring the truth to light collide with the orchestrated darkness around them.
Tensions erupt when Miriam fires Velma, and soon after, Velma’s own fate is sealed by a brutal blow that sends her down a stairwell. The murder appears to be accidental, but Drew and Miriam push forward with their plan as Charlotte sinks deeper into fear and confusion. One fateful night, a drugged Charlotte stumbles downstairs, convinced that John has returned. In a dangerous ploy, Miriam tricks her into firing a gun loaded with blanks at Drew, and the body is hidden away in a swamp. Yet Charlotte’s torment does not end there; she witnesses what seems to be Drew reappearing, and the sight shatters her remaining defenses, pushing her toward a full descent into madness.
Meanwhile, Miriam and Drew celebrate their supposed triumph and discuss a future in which Charlotte is committed to a psychiatric hospital and deprived of her fortune. Charlotte, listening from a balcony, overhears nearly everything—but Miriam’s admission that she witnessed Jewel kill John remains sealed in silence. The emotional fuse finally snaps when Charlotte pushes a heavy stone urn from the balcony, casting Miriam and Drew into the garden below and ending their manipulation in a brutal crescendo of consequence.
The morning after, authorities escort a shell-shocked Charlotte from the house while a crowd gathers to witness the spectacle. An envelope arrives for Charlotte, delivered by Mr. Willis and passed along by Jewel after Jewel’s sudden stroke, which Jewel herself suffered following the night’s revelations. The letter ostensibly confesses to John’s murder, a final twist in a case that has long shadowed the Hollis family. As the convoy departs and the house recedes in the distance, Charlotte casts a last, lingering glance back, leaving a quiet question hanging in the Louisiana air: what really happened that night, and what price is paid when money and memory collide?
