A Phoenix secretary on the run (Janet Leigh) checks into a shady motel run by the mysterious Norman Bates (Anthony Perkins) and his overbearing mother.

Source: https://collider.com/horror-movies-that-redefined-the-genre/

On the run, she arrives at a motel owned by Norman Bates (Anthony Perkins) and is swiftly murdered by his mother.

Source: https://www.independent.co.uk/arts-entertainment/films/news/best-movie-twists-shocking-films-b2276042.html

Soon after, Marion's boyfriend Sam Loomis and the villain Norman Bates take over the narrative, and viewers learn the chilling truth about Norman and "Mother."

Source: https://www.cbr.com/best-horror-movies-on-netflix/

Think of the silent explanation of Jeffries' injury in "Rear Window," or the owl perched above the sinister Norman Bates in "Psycho."

Source: https://www.slashfilm.com/1150133/alfred-hitchcock-was-christopher-nolans-guiding-light-while-directing-dunkirk/