Vertigo (movie)
The film script (screenplay) is based on the French novel D'entre les morts (From Among the Dead) by Pierre Boileau and Thomas Narcejac. In the book, Judy reveals the murder plot at the climax. Judy reveals the plot two-thirds way in the film. This would show the internal conflict of Judy. Judy wants to be with Scottie, but also wants to stay away from him. Hitchcock wanted to delete the letter-writing scene, but it remained in the movie.