Vertigo spoilers explained

What is the main twist in Vertigo?

The twist is that Judy Barton (Kim Novak) is actually Madeleine Elster, the woman Scottie Ferguson (James Stewart) was hired to follow. Gavin Elster (Tom Helmore) hired an actress, Judy, to impersonate his wife Madeleine as part of a murder plot. The real Madeleine was pushed from the bell tower by Gavin, and Judy, disguised as Madeleine, faked a suicide attempt to make Scottie believe she was possessed by a ghost. The entire romance between Scottie and the fake Madeleine was a setup to provide an alibi for the murder.

What happens in Vertigo?

John "Scottie" Ferguson, a retired San Francisco police detective, suffers from acrophobia and vertigo after a traumatic incident where a fellow officer fell to his death while Scottie clung to a gutter. He is hired by an old college acquaintance, Gavin Elster, to follow his wife, Madeleine. Gavin claims Madeleine is possessed by the spirit of her great-grandmother, Carlotta Valdes, who committed suicide. Scottie begins tailing Madeleine, observing her as she visits a flower shop, the grave of Carlotta, and the Palace of the Legion of Honor, where she stares at a portrait of Carlotta. Scottie rescues Madeleine from the San Francisco Bay after she jumps in, and they begin a romance. Madeleine tells Scottie about a recurring nightmare involving a bell tower and a Spanish mission. Scottie takes her to the Mission San Juan Bautista, where she runs into the bell tower. Scottie, paralyzed by his vertigo, cannot follow her up the stairs. He sees her body fall from the tower to her death. A coroner's inquest rules it a suicide, and Scottie is wracked with guilt and depression, suffering a nervous breakdown.

After months in a sanitarium, Scottie wanders San Francisco, seeing women who remind him of Madeleine. He meets Judy Barton, a working-class woman who physically resembles Madeleine. Scottie becomes obsessed with transforming Judy into Madeleine, insisting she dye her hair blonde and wear the same gray suit. Judy, who is actually the woman who impersonated Madeleine for Gavin Elster, reluctantly agrees because she loves Scottie. She reveals in a letter that she was part of the murder plot: Gavin Elster hired her to play his wife, fake the possession, and then fake her suicide by throwing a dummy from the tower while Gavin pushed the real Madeleine. Judy tears up the letter but cannot bring herself to leave Scottie.

Scottie completes the transformation, and when Judy emerges in the gray suit and blonde hair, he kisses her. But he notices a necklace she is wearing, identical to one in the portrait of Carlotta Valdes. This triggers his realization that Judy is the fake Madeleine. He drives her back to the Mission San Juan Bautista, forcing her to climb the bell tower. He confronts her, shouting that she was the one who played the part, that she was the one who let him fall in love with her while she was part of a murder plot. Judy confesses her love and begs for forgiveness. Scottie says he no longer cares about the murder, but he is horrified by the deception. A nun suddenly appears from the shadows, saying, "God have mercy on your soul." Judy, startled, steps backward and falls from the bell tower to her death. Scottie stands on the ledge, looking down at her body, his vertigo overcome but his life shattered. He stands frozen, arms outstretched, a broken man.

Quick, non-spoiler context

A retired San Francisco detective suffering from acrophobia investigates the strange activities of an old friend's wife, all the while becoming dangerously obsessed with her.