The nice thing about Hitchcock's masterpiece is that, despite its incredible plot twists, it's a hard movie to spoil. I could tell you what one or two of the revelations are, but they wouldn't make sense without a fair bit of context first. I'll give you some context, but I won't spoil the film here.
James Stewart (one of my favourite actors ever) plays John "Scottie" Ferguson, a detective who retires after an incident in which, while on a chase, a police officer falls to his death trying to save Scottie from hanging off a building. The doctors diagnose Scottie with acrophobia; a fear of heights (often confused with the dizzy sensation known as vertigo). He encounters an old school friend, who asks him to follow his wife Madeline, concerned for her welfare. It seems Madeline believes that she is possessed by someone from the past; a mysterious figure named Carlotta.
