David I. Starrling [Zachary Scott] returns from a business trip bearing gifts for his six-year-old daughter Susan [Gigi Perreau] and for his wife Celia Starrling [Kristine Miller]. He also brings back World War II souvenirs, including a handgun. Celia is not at home; she’s with Crane Weymouth [Tom Helmore], the fiancé of her sister Dell Faring [Ann Sothern], and he’s the man Celia has been seeing. David spots Celia stepping out of Crane’s car, which makes his suspicion of her story about seeing a matinee with a friend feel dangerously real.
That evening, Crane and Dell come to dinner. Afterward, David pulls Crane into a quiet talk and forces him to admit that he and Celia had been together that afternoon. Dell, who believed Crane’s business trip story, excuses herself to leave, and Crane departs with her. The tension between Celia and David spills over into a heated argument; Celia fears exposure, while David tries to confront her about the affair. In a tense moment, Celia urges him to lock the handgun away in the study. As he steps toward the door, he notices a monogrammed handkerchief in the pocket of Celia’s robe—Crane’s monogram that proves the affair. He moves to confront Celia, but she interprets the situation as a threat and strikes him with a hand mirror, knocking him unconscious.
Dell has arrived by then, assuring Celia that David is still alive. The two sisters reignite old resentments: Dell feels Celia has already taken too much from her, and she is angered that Celia would do so again. In a fit of jealousy and fear, Dell shoots Celia. She staggers toward the doorway, the scene casting a stark, distinctive shadow upon the wall. Dell discards the gun and flees. David, suddenly conscious, staggers to the doorway, then collapses again as Susan’s terrified screams begin.
With no memory of the night’s true sequence of events, David stands trial for first-degree murder, and the jury convicts him. He accepts the verdict and accepts the death penalty. In the wake of the tragedy, Dell writes a confession but, while waiting at a hairdresser, destroys it in a moment of panic when the heat of the hairdryer seems to echo the electric chair.
Susan’s memory remains buried, though the girl is haunted by the shadow on the wall. She is committed to a psychiatric hospital, where Dr. Caroline Canford [Nancy Reagan] believes a cure is possible. Canford suspects that Susan’s memory holds the key: she hopes to unlock the truth by letting Susan revisit the moment with her father in prison. But it does not help at first. Canford uses play therapy to coax Susan’s memory forward and discovers Susan’s fear stems from something seen in the doorway, not merely the gun or the adults acting as parents in a reenactment.
As the doctor presses, Dell, ever calculating, tries to undermine the process with a dangerous plan: she poisons and drowns, then attempts to kidnap Susan. Canford persists, taking Susan to the Stirling apartment to recreate the night of the killing. When Susan enters the room, she is not distracted by the adultos’ performances; she focuses on the open doorway. To Canford, this suggests a third person was present that night.
Canford, Pike Ludwell [John McIntire], and Susan drive to Dell’s Connecticut home to uncover the truth. Outside, Dell’s lights glow against the night as they prepare to leave—until Susan, glimpsing Dell’s shadow on the wall, cries out, “Cupid, Cupid.” Dell’s shadow, a chilling echo of danger, becomes the pivotal clue that leads to the final confession. In a fraught confrontation, Dell reveals herself as the source of the fear and the chain of events that destroyed the family.
Note: The story weaves together a chilling examination of memory, guilt, and the long shadows cast by jealousy and concealment. The film moves from domestic strife to a courtroom drama, then into a clinical exploration of trauma and reconstruction, culminating in a dramatic unmasking of the killer’s identity through a child’s repressed memory and a killer’s fragile, fear-driven motive.
- The cast includes Zachary Scott as David I. Starrling, Kristine Miller as Celia Starrling, Ann Sothern as Dell Faring, Gigi Perreau as Susan Starrling, Nancy Reagan as Dr. Caroline Canford, John McIntire as Pike Ludwell, Tom Helmore as Crane Weymouth, and other notable performances that deepen the suspense and emotional impact of the story.
