Invisible Storytellers

"Let me tell you a story," each film seems to offer silently as its opening frames hit the screen. But sometimes the film finds a voice—an off-screen narrator—for all or part of the story. From Wuthering Heights and Double Indemnity to Annie Hall and Platoon, voice-over narration has been an integral part of American movies.

Through examples from films such as How Green Was My Valley, All About Eve...