Betrayal is a 1929 American Synchronized sound drama film produced for Famous Players–Lasky and released by Paramount Pictures. While the film has no audible dialog, it was released with a synchronized musical score with sound effects using both the sound-on-disc and sound-on-film process. The film is the last film without audible dialogue that was directed by Lewis Milestone, the last non-speaking role performance by Gary Cooper, the last non-speaking performance by Germany's Emil Jannings, and the only onscreen pairing of Cooper and Jannings. It is considered a lost film.

Plot

Swiss peasant girl Vroni (Esther Ralston) is having a secret summer romance with Viennese artist Andre Frey (Gary Cooper). When Andre later returns to Switzerland, he learns that Vroni has been forced to marry wealthy burgomeister Poldi Moser (Emil Jannings). Explaining Andre's appearance, Vroni introduces him as a young man who has just lost his sweetheart, and in sympathy, Poldi invites Andre to be a guest in his house.