Elizabeth Rew is a lonely New York City teenager who gets a mysterious job at the New-York Circulating Material Repository, a library that lends out objects instead of books. She discovers the magical Grimm Collection, a room containing real objects from fairy tales like Cinderella's glass slippers and Snow White's stepmother's mirror. When dangerous items begin to disappear from the collection, Elizabeth and her new friends must solve the mystery and stop a thief who could use the magical objects to cause real-world chaos.