From the Mixed-Up Files of Mrs. Basil E. Frankweiler is a novel about Claudia Kincaid who runs away from home with her brother Jamie to live in the Metropolitan Museum of Art. The two children become interested in a Michelangelo sculpture of an angel donated by Mrs. Basil E. Frankweiler. They go to Frankweiler, who has them research the angel's secret using her mixed-up files. Frankweiler leaves out one essential file and, in her will, promises the children the file in exchange for the story of their running away.