Ruth Fielding in Moving Pictures by Alice B. Emerson

Ruth, Helen, and Tom watch a movie crew film scenes near the Red Mill. As they watch, the starring actress, Hazel Gray, falls into the river and is swept downstream. Ruth and her friends rescue the actress and take her to the Red Mill to recover. The next day, Ruth meets the producer who promises to read Ruth's script when she impulsively confides that she is planning to write one.