From the Mixed Up Files of Mrs. Basil E. Frankweiler (1995)

This is a solid movie. 11-year-old Claudia Kincaid (Jean Marie Barnwell) earns straight As in school but still does not feel appreciated by her parents. She convinces her younger brother Jamie to run away with her and they hide out in the Metropolitan Museum of Art in New York City. When a statue of an angel is put on display, the kids decide they want to discover whether it was really created by Michelangelo. To find the truth, they will have to visit a wealthy recluse (Lauren Bacall) who is the likely donor of the statue.

This film is based on the 1967 novel written by E.L. Konigsburg. There is also a 1973 film version starring Ingrid Bergman.