The Woman Who Was Forgotten (1929)

Miss Miller, a dedicated teacher beloved by her students, loses her job when she protects a favorite pupil, Richard Atwell, who is accused of embezzling from Mr. Riggs's bank. Years later, Richard organizes a banquet as a testimonial to Miss Miller's inspiration throughout 40 years of service, at which is presented a confession to that long-ago crime (possibly committed by Percy Riggs), an apology from Mr. Riggs, and the promise of a principalship of a new school.