Beth and Patsy are spending the winter in Hollywood with Uncle John, and are noting the booming film industry. While attending a premiere of a film that Beth and Patsy accidentally guest-starred in, they meet another set of Aunt Jane's nieces: Maud and Flo Stanton, nieces of Jane Montrose, and becomes friends. During the course of the book they save a young man Named A. Jones from drowing and become friends with him. Beth and Patsy come up with an idea to produce films for children and have theaters designed for them. A. offers to back the project. However, these plans seem to meet an early demise as a detective arrives and claims A. is actually an international pearl thief! Uncle John, Arthur, the Nieces, and the movie starlets cannot believe this claim, but soon A. is put under arrest and they have to scramble to find the truth of A.'s life and prove his innocence!
