Who knows the secret of Mrs. Frankweiler's mixed-up art files? The Hideaways, that's who! Ingrid Bergman joins Richard Mulligan, Madeline Kahn and newcomers Sally Prager and Johnny Doran in a charmer based on the beloved book From the Mixed-Up Files of Mrs. Basil E. Frankweiler. Prager and Doran play Claudia and Jamie, a sister and brother who run away from home to the neatest hideout ever: the Metropolitan Museum of Art. Neither imagines their expedition will plunge them into the mystery that has all New York abuzz. Everyone wants to know if the new statue of an angel donated to the museum by reclusive art collector Mrs. Frankweiler (Bergman) is a Michelangelo work. Claudia is sure that learning the answer will make her adventure a success, so she and Jamie decide to find out -- even if it means (gulp!) confronting cantankerous Mrs. Frankweiler!

A young brother and sister run away from home and hide out in the Metropolitan Museum of Art. There the girl becomes entranced with a statue which has baffled experts. She becomes determined to track down its former owner and uncover the secrets for herself. Based on the children's book "From the Mixed-Up Files of Mrs. Basil E. Frankweiler."