The Little Brother on AllMovie

Jerry Ross (Enid Bennett) is a street urchin who has disguised herself as a boy so she can easily sell newspapers on the street. One day. when she gets into a fight with another urchin, she catches the attention of Frank Girard (William Garwood). Believing that Jerry is a boy, he adopts her and sends her to boarding school. She immediately reveals her sex there and is put in the girl's division, while Girard, oblivious, is at home trying to discover a formula for dissolving opals. Jerry comes home from school, at last letting Girard know she's female. She discovers the formula he is looking for and leaves because she doesn't want to stand in the way of his romance with another woman. But Girard follows after her and saves her from a bad guy who is trying to force himself on her. Thus Jerry and Girard wind up happily together.